Fuel Pump Pressure Diagnosis (return type system)

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This is a 1991 GM TBI system. I know it is old and we don't see many of these systems anymore, but the fundamentals still apply to ALL fuel pump and fuel delivery designs. From the mechanical return type, to mechanical return-less (regulator in the tank), to electronic return-less (no regulator) systems. Even the low pressure, delivery side, of today's GDI systems! Fundamentals my friends, they do not change and this video will be valuable information for troubleshooting all of these systems. Sure there are some minor differences in testing, depending on the fuel delivery design, but the core of this is the same!
What is covered in this video:
1. How to identify a lean condition
2. Visual spray pattern test of a TBI injector
3. Using the oxygen sensor to ID a fuel delivery problem
4. Measuring fuel psi on a return type system
5. How to check fuel pump max psi (dead-head test)
6. Fuel pump power and ground testing
7. Fuel pump current and RPM measurements
8. How to ID a good ground on your meter
9. Fuel pump motor disassembly to show brushes and commutators
10. Discussion of testing for bleed down issues
ScannerDanner Tools:
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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2 окт 2024

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Комментарии : 321

@ScannerDanner 3 года назад

@lomakahl 3 года назад

How do you reset the TPMS on a 2017 GMC Sierra? The letting air out trick didn’t work on mine.

@tomfletcher2345 3 года назад

Scanner danner, can I email you please? I've run into a no comm problem on a 11 ram 1500 5.7

@brucegill4218 3 года назад

Thanks Paul you stay safe talk to you later

@rickyboyd2919 2 года назад

I’ve been waiting on this video for 2 years. I’ve had troubles ever since my filter was clogged. Many thanks for the video. You provided details that others glossed over or didn’t show. 1995 K1500 TBI here. Your doing some good in this world in many ways.

@ScannerDanner 2 года назад

@@rickyboyd2919 thank you for these words tonight, felt divinely influenced because I needed to hear this

@frankgonzalez24 3 года назад

My dad owned a 90 chevy van that had that same TBI setup. It was the first fuel injection setup I ever worked on. It is real easy to work on and fixed compared to todays F.I. setups.

@throttlebottle5906 3 года назад

easy, except for it being a van and requiring half the interior removed to get at it. lol

@mph5896 3 года назад

20 years ago, one of those TBI systems kicked my butt. Rubber hose inside tank was split like that one. Special rubber hose is required for submersed fuel line. If you don't use that, it degrades and blow a hole in it.

@throttlebottle5906 3 года назад

been there done that, replaced many of them that dry-rotted and split. a tell tale sign is listening to the fuel filler with cap off and tank less than 1/4 filled, it sounds like a waterfall inside when running or key turning to prime the system or powered with test connector. make sure it's submersible rated fuel hose/section and it's always a great idea to replace the pump and strainer screen while at it! I got bit by that a few times.

@donspirz4199 Год назад

I couldn’t believe it when I seen it! I just removed my neighbor’s fuel pump in his 1991 GMC Sierra TBI. I watched your video and did my testing the best I could with just my multi meter. I determined it was the fuel pump since I do have voltage with a load and a solid ground at the pump and no fuel pressure at all. My filter was restricted but not blocked but figured the pump went out because of the restriction (old age). I tilted the bed and removed the pump and took a look at it afterwards and I couldn’t believe that mines had a crack (tear) in the exact spot as the one in your video! The exact same truck, make and model. I watch videos to get myself familiarized before I start and see what I might run into since my mechanic days are over for me because of my age (70). The symptoms I had are exactly like yours in the beginning of this video. Engine starts but won’t stay running and can’t increase RPM’s, falls flat on its face in a second or two. Would run if spray carb cleaner into the throttle body. As soon as I seen the tear in my pump, I remembered this video and had a good laugh that is had the exact same problem. I’m lucky here in Hawaii as our vehicles aren’t rusty underneath, all of my fasteners were easy to remove with minimal rust. Thanks for the video and tips which made my experience in fixing my fuel problem easier to resolve.

@Ken-wu6hr 3 года назад

I’m in Texas. My Family has 3 TBI Trucks. & I get a Lot of OBS customers. I just put the adapter in place of the Filter. Plus I have a working Red Brick. They also blow out the fuel hose between the pump & strainer that can throw you for a loop. My truck is a 88 C3500 tbi 454

@eriksheridan2923 2 года назад

Hands on is everything no matter what year it is love the vids bubba

@Jpilgrim30 2 года назад

That pico amp clamp automatically zeros every time you cycle the power on them. I love my pico clamps. Saves me a lot of money on 9 volt batteries 😂

@oldbiker9739 Год назад

I still own a truck just like that one , there so easy to work on , I will never buy a new truck again , I still have the propane system and gasoline system ,and every thing still works .

@ganeshnarayan5505 3 года назад

Hello Mr. Danner thank you for sharing this video i learned lot of things from your videos.

@grantbellinger7403 2 года назад

Dead right cobba

@ganeshnarayan5505 2 года назад

@@grantbellinger7403 what the hell is a cobba.

@grantbellinger7403 2 года назад

Hehehehe,it’s australia n for mate,cobba

@ganeshnarayan5505 2 года назад

@@grantbellinger7403 OK.. WHAT EVER

@scientist100 3 года назад

Mechanics even ask me: "Why do you buy expensive scanners?" and then answer the question themselves saying because "it tells you everything". I wonder how are they mechanics when they don't understand a tool that is so important in this industry. A lot of mechanics only think that a mechanical tool to replace parts is all they need.

@johnc4352 3 года назад

New math formula… Count the bacon bits in Danner’s beard, divide by 3, gives you how many donuts he ate! Thanks guys.

@ScannerDanner 3 года назад

🤣🤣

@thomasdemarco617 3 года назад

nice to see you back on Dan tell us more about wot o2 test

@ScannerDanner 3 года назад

:-) my name is Paul, check this video out, it will give you a good idea on how to use this test ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-1-2lqdDE0PQ.html

@isalmankhan1 3 года назад

Superb, Thanks for sharing SD Love it👍 Great video on testing properly a faulty fuel pump👍 Love the math part😉 Special thanks to James Danner & Caleb👍 Stay Safe Guy's❤

@johneric3886 2 года назад

I agree James Danner seems like a pretty cool dude. It's good to watch a family atmosphere, especially this day and age...... You know I really think Paul and his brother could have a small radio show on NPR --------- they used to have an automotive show called clicking clack, I believe.

@JimmyMakingitwork 3 года назад

Bacon and phlegm donuts, lol. I gotta say thank goodness for spellcheck on that sentence.

@ScannerDanner 3 года назад

🤣🤣

@PistonShack 3 года назад

Such a coincidence) I just replaced weak old 17 years old Fuel Pump on my Nissan Titan. All troubleshooting was done according to your book! God Bless You!

@ScannerDanner 3 года назад

heck yeah! awesome, thank you

@bartscave 3 года назад

I’ve seen deteriorated hoses inside many pumps used on marine outboard engines caused by ethanol.

@DillonTurner395 Год назад

Purchased a 91 s10 with a 4.3. Dude unloaded a parts cannon at it because it would idle up and down, and die when given any throttle. Fuel was dripping out of the injectors trying to run so I questioned injectors but didnt want to just fire injectors at it. Guy had already replaced the entire throttle body but that still doesnt mean it was good. Infact I think the throttle body came from either a 5.0 or 5.7 because it ran fairly rich after replacing the pump. Found on a forum that with a fresh pump if you unhook the filter itll shoot fuel like 6 feet. I unbolted my filter, keyed it on and barely got a dribble. Put a pump in and tried the same thing and ended up with the gas version of a super soaker under the truck lol bolted everything back and it ran very well after that just rich.

@KnuckleHeadGarage27 2 года назад

Haha these videos with ur brother in the back ground either eaten or singing is hilarious always good to see videos like this and especially on older vehicles . But i had a 88 S10 2.5 5speed an it did this issue an worse on turns an so i had a idea to fill the tank up or put more gas in it an sure enough that's exactly what was wrong the hose inside the tank for the fuel pump had a hole in it and when I had a full tank it would run good . An then I started to hear the fuel pump spraying inside the tank from that hose being bad so I knew for sure that's what had happend .

@ricothechimpanzee6596 3 года назад

Hey scannerdanner! Last week our van broke down and we just so happened to breakdown next to you and you ended up saving our church van from a rats nest in a part of the engine, we got down safely and had an incredible time and I wanted to say thank you once again for helping us!

@ScannerDanner 3 года назад

This meeting was ordained by God, no doubt in my mind. I can't stop smiling every time I think about it. I got to see some of the worship on some FB posts and I would have loved to have been there with you guys for that! This entire thing felt like I got to meet part of an extended family that I didn't even know that I had. Pray for me to be a light in the darkness as I will do the same for you.

@dans_Learning_Curve 3 года назад

Awesome! Good stuff! So, it was rodent damage?!

@dmto7430 3 года назад

Good find! Shout out to the owner that keeps the truck in such a nice shape! Also, Ivan had something similar on "Eurotrash" last episode where a plastic line got disconnected internally. But first he had to undo all the other stuff people had doing beforehand to even be able to diagnose it, was quite a case.

@fmbfla 3 года назад

That pump looks like one that was not designed for ethanal fuel causing the rubber to "rot The use of an adjustable timing light is what I used to watch fuel injector pulse to the TBI's to check fuel delivery or a clogged/dirty injector.

@cullenmiller8170 3 года назад

Okay now that I watched this and slacked off enough this morning it's back to your lectures on the Verus scan tool. The one I bought came with the board and I can follow your class along. Lecture 12 here I come.

@ScannerDanner 3 года назад

Nice! Thanks Cullen

@theomnipresent1 3 года назад

Don't knock the bacon maple bar till you try it. I had the same hesitation, now it's one of my favorite's.

@barbarashontz7383 3 года назад

bacon belongs where ever bacon wants to be

@Phantomas2011 3 года назад

Love all your videos, I wish I could have seen you use the old snap on brick 😜

@dpaulak 3 года назад

believe it or not i use to pull the injector/injectors out on T.B.I on gm and grind the spot weld ( carefully ) on top of the regulator screw and put it back on. Then use a 90 degree tool i made that i could "shoe horn " in to the bottom side of the throttle body unit to adjust pressure with vehicle running, 9lbs was ideal running pressure i found. Of course pump pressure had to be in range.

@brentowen9480 3 года назад

I brazed a schrader valve into a new fuel filter to check pressure on these systems.

@codysautodiagnosticsprogra8706 3 года назад

Always a great video Paul. Thanks for your time. Now wouldn’t checking pump rpm show how the hose is split and causing the “overrunning” speed of the pump, like being out of gas? The ones I’ve had the current is low, rpm is high is usually a good clue of out of gas or split hose in tank.

@ScannerDanner 3 года назад

it wasn't much lower, not enough for me to even think along these lines my friend. 3 amps before, 4 amps after the fix, and only about 600 rpm difference too

@JD-iu3vi 3 года назад

My 89 c2500 fuel pump did the same thing. It had a split in the rubber hose. It had a full tank of gas so I did not want to drop the tank. I removed bolts that hold the bed on except the last two on the back and left them real loose. I tilted the bed up and changed the pump.

@raviautoscanning 3 года назад

Great explanation. Very important

@MarioDallaRiva 3 года назад

Bubbles and socks...I saw them at the peeler bar many years ago! Mmm, doughnuts mit bacon 😋😋

@nellyxavier8923 3 года назад

Just started whith fuel system ..SD Book....thank you Sir !

@ScannerDanner 3 года назад

Nice! Thanks so much! Don't let the age of the example here in this video make you tune out (some do). Fundamentals my friend, right? It still applies

@douglash3129 3 года назад

Hey Paul, maybe you should try using a smaller screw driver on that hose clamp. HAHAHAHA!!

@ScannerDanner 3 года назад

🤣🤣 right?

@GameBacardi 3 года назад

What you are eating ? - Fuel pump

@GhettoWagon 2 года назад

Those hoses split all the time on those old TBI vehicles. Its a wear item. 10 years. Change it and the sock. I think the OEM submersible hose of that era was not as good as it is today

@VashthStampeede 3 года назад

That "hose" isn't really a hose. It's thicker and called a pulsator. It's supposed to smooth out any pulses in the fuel delivery. A new one is supposed to come in the box with the new fuel pump. Can't ignore changing that part. Great video with lots of useful information.

@joe1273 3 года назад

No thats just a hose, pulsators are metal and look like a small old school master cylinder cap.

@ScannerDanner 3 года назад

this model did not have a pulse dampener, some did, some did not, as @VashthStampeede said, this was just a hose. Thanks! Good info for others

@VashthStampeede 3 года назад

@@joe1273 I know the part you are speaking of, however some were just a piece of hose about twice as thick as fuel hose only without braiding. It served the same purpose as the metal one. Nonetheless my point was a new one comes in the box for a reason, and should not be ignored when changing the fuel pump. If the pump had been recently changed, as Paul suspected, the changer screwed up by leaving the old one in. I've been ASE certified since it started in 1975 and know what I'm talking about.

@troutjunkie7330 3 года назад

I'm sorry but the old style pumps NEVER work harder no matter where the resistance is (plugged filter, kinked hose, whatever). The old myths never die. It is electric motor spinning the same RPM, supplying the same PSI on the outlet of the pump. It does not matter where the flow stops at the rail just before the injectors or at the fuel filter. On the new cars with rail pressure sensor, the controller can run the pump dead seeking pressure that could be missing from plugged fuel filter but not on these old cars and trucks.

@ScannerDanner 3 года назад

Old myths? What happens when a fuel psi regulator sticks closed? I promise, you will destroy the fuel pump. Same scenario with a plugged fuel filter.

@NorthernIrelandFishingReports Год назад

Hay bro. Great video. Can you tell me. Would a blocked injector cause high fuel pressure.

@cjoakman7715 3 месяца назад

Question...what if you have to check pressure on a TBI system that has the plastic type fuel lines at the filter. How would you tap into that?

@LAW-fv6ys 2 года назад

I've had a fuel pump on a 2.0fsi vw golf 2006 which would run great for nearly 2hrs and then misfires into limp mode not allowing over 3k rpm. Turns out if I had low fuel level it would do it sooner than 2hrs, especially if I stayed in a layby after a hard drive and let it heat soak. The reason was a weak pump which when the return fuel comes back to the tank its hot and then warms the whole fuel tanks fuel, this caused the pump to become weaker to the point it would reduce flow under load. Was a very hard one to diagnose. Live data on vcds logs just caught it once so I could see the tps go to 0, even though my foot was planted, the rpm bounce at 3k in limp mode and then I could see the low side pressure had dropped from 5.5bar to less than 3bar. The new pump held 6bar dead irrespective of load and its is pwm system so it should hold a fixed value. The hpfp is also a big failure item on these cars but the live date log showed the hpfp pressure were excellent. Is there any way to fault find this any type of issue any quicker guys?

@XxXButtXNuggetsXxX 3 года назад

ScannerDanner takes 15 hot dabs in a row 🥵

@Pablo_Automotive 3 года назад

Nice explanation team Danner.

@htownblue11 3 года назад

What a thorough breakdown. This diagnostic process eliminates variables one by one and helps to ensure the correct course of action is the final decision. An hour of diag time is worth three hours of needless parts shotgunning. Well done Danner as always. Watching you and your brother cut up is a bonus.

@ScannerDanner 3 года назад

thanks so much! And yeah, working with my brother with my son filming is a pretty cool dynamic :-)

@blackericdenice 3 года назад

Gm should have spent more money on their tbi.

@bosaadbosaad6792 3 года назад

Thank you very much always i learn from you now i will not be late to refill my tank of fuel to prevent pump of heat and loose brushes right?

@alonzowhite4382 2 года назад

Scanner Danner my name is Lonnie I watch show all the time I have Ford f150 truck put a lots of money the light what for 3day it come black on check engine light POO21 code what cause it be scanner danner

@mustangracer5124 3 года назад

Can you recommend a good scan tool for the home mech?.. I have 35 yrs of exp. on high tech diagnostics for million dollar equipment.. but never got my own home diag. tool.. I have a no code condition of rough acceleration and don't want to start throwing parts at it.

@haluke101 3 года назад

Inner tire tube kind of material was blocking fuel line and intermittently blocking fuel line at shop work and runs perfect test drive perfect when hand it the costumer tow trucks brings back to shop 1949 vw bug I used shop air blowed up it made funny noise and come up from the line

@cassandralesh8536 3 года назад

Those GM TBI were bad about cracks in the throttle body. Leaked fuel. Would start but no drive.

@gerrymoeller 3 года назад

If the split was the whole issue I would think you would have had equal to lower amperage but a faster rotational speed as it would be flowing more fuel.

@josephwash109 3 года назад

That might have been the original equipment pump, seeing as how the truck has less than 30,000 miles. The main reason I suspect that is because of the black strainer sock; I haven't seen a black sock on any modern pump recently (they're usually white, yellow or green). The old rubber hoses also didn't hold up well to the newer gasoline blends and tend to swell or crack.

@ScannerDanner 3 года назад

You may be right! 25k on that pump, which wasn't much

@oldbiker9739 Год назад

ethanol gas

@alonzowhite4382 2 года назад

It me again the is 2004 Ford f150 truck in code is POO21 what can I do for it my name lonnie

@m.b.smoshitoa8325 3 года назад

LoL, Paul I heard you condemning Danner for eating in camera. There's nothing wrong about that. And this makes your videos to be like live. I feel like I am also there with you live. Again it doesn't change the importance of the video

@ScannerDanner 3 года назад

🤣 I just didn't want you guys to have to deal with eating noises lol, as I hate to even hear myself eat. Thanks my friend

@garylee1544 10 месяцев назад

Love they Video's at Danner's Shop. Best Wishes Mrs. Danner!

@farmermiyagi1338 2 года назад

I get a lot of these where I am. I shouting at you, it's grounded where the connector is bolted to the frame!! Snatch that bed off and slam a pump in it. ;)

@magrisers 3 года назад

BRO,WHENEVER YOU WANT TO SAY IT'S SIMPLE, JUST SAY , IT IS NOT A F. ROCKET SCIENCE I CALL DUMB PEOPLE ROCKET SCIENTISTS REST GET THE MEMO

@michaelhanglow5051 3 года назад

Can you determine how old the pump is by a visual inspection? As I type, you opened up the pump. 🙂

@bymarcatholictinkering Год назад

Junk parts is no joke . Not allowed to have parts made in America

@craftsman673 2 года назад

Thanks! I feel a little smarter now... Let's get this camaro back on the road

@Silentb00 3 года назад

You should try that bacon donut it’s delicious. I said the same thing you did when I first saw it. Try it

@robertmobileman8304 3 года назад

good job , great content, and as always great camera work Caleb .....

@OneLegged-honda-mechanic 3 года назад

The outtakes at the end were cracking me up 😂

@Bwelsh1981 3 года назад

Crap. I Remember when there was ton of these still on the road. How simplified.

@Jacob-qz2mo 3 года назад

Love it, old school testing, Fundamentals.

@eddiereichel9354 3 года назад

2:00 This would be where different misfires do different things. Fuel delivery issue causes total lean misfire. Ignition misfire would read rich on that bank due to unburned miss ignited mixture?

@ScannerDanner 3 года назад

believe it or not, the ignition misfire will still be lean ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-G_89r12vZFw.html

@fire7765 3 года назад

Good job

@ralfsautomotive 3 года назад

LOL, Awesome, been there done that. I remember there was some issues with the Ground on those. 13/16 = 0.8125" 20/25.4 = 0.7874 LOL I had to.

@leegriep75 Год назад

On my 88 the fuel line to the tbi is braided so I'm able to tee in right behind the tbi.

@EddieLeal 3 года назад

People trying to save money will more times than not purchase low cost aftermarket parts instead of going with OEM parts. That said, a number of companies make parts designed to function the same, or in some cases even better than the original. It's estimates that about 80% of independent shops use aftermarket parts. We need to be informed consumers and do our due diligence/shop around. Make sure you're dealing with a good mechanic and request high-quality aftermarket parts if that's the rout you want to go. Like everything in life aftermarket has its caveats . 1. Quality varies greatly: The saying "you get what you pay for" rings true here. Some aftermarket parts are inferior because of the use of lower-quality materials. Stick with aftermarket brands you're familiar with or are recommended by a mechanic you trust, even if these parts cost a bit more. 2. Overwhelming selection: If you're not familiar with aftermarket brands, the selection could be overwhelming, and there's some chance you may get a bad quality part. Even a part as simple as a spark plug can be made by dozens of different companies and comes in numerous variations. Consult your mechanic for advice or simply stick with the OEM part when the price difference isn't significant. 3. May not have a warranty: To keep costs down, some aftermarket parts are sold without a warranty. Sooooo, when should you request OEM Parts? When it comes to collision repairs, make sure you are getting OEM parts, since aftermarket body panels may not fit properly or have proper crumple zones for crash safety. If you lease your car, there are also economic considerations. Since aftermarket parts decrease a vehicle's book value, using them to repair your vehicle's body may cost you part or all of your security deposit. But here's the rub. In 21 states and the District of Columbia, a body shop's repair estimate does not have to indicate whether aftermarket parts will be used. You'll often find that your insurance company will favor aftermarket parts because they are cheaper. If you request OEM parts, some insurance companies ask you to pay an additional fee. Check with your insurance provider beforehand, to see what parts they will cover. Which is the best way to go you ask? Great question. All aftermarket parts are not created equal however all OEM parts are. This creates its own set of advantages and disadvantages. If you're familiar with a number of brands or work on your own car, aftermarket parts can save you a lot of money. If you're not familiar with aftermarket brands, prefer to have everything done at the dealership and don't mind paying a bit extra for that peace of mind, OEM is a good choice for you. Hope this helps. Stay frosty out there America!

@johngallano1339 Год назад

Best video out for the Tbi system. I’m having a huge problem. My 90 c1500 305. I replaced the injectors in the throttle body and now the truck won’t go over and sputters at 50mph. I’m getting 13 psi. Has new fuel regulator,new fuel filter, new injectors, new air filter, new o2 sensors. Can anyone help?

@ScannerDanner Год назад

It won't go over 50mph? Let's check it for a restricted exhaust next. The quick and dirty way is to remove the upstream O2 sensor and drive it briefly. If power is significantly different with that extra hole to breath from, your cat is plugged.

@mr_mnky Год назад

awesome video. question: In your opinion, in the case of a bad check valve with a slow bleed-off, would you still recommend replacing the fuel pump, or would you just leave it in? I've got a '98 tacoma with the original fuel pump & a slow bleed off (drops from 40psi to 30psi in about an hour, and slowly goes to zero psi hours after that). Other than that, the pump seems to work fine; it's definitely the check valve though.

@ScannerDanner Год назад

100% not a problem. They all bleed down over time. As long as you don't have a long crank time, I wouldn't worry about it!

@dodsjanne 6 месяцев назад

So much good info here. Invaluable

@scrappydope Год назад

love your videos...been reading your book...but I had the same problem with my mom 98 chevy tahoe 5.7 vortec...i usually change it out myself but my mom needed it change out since it was boggy so she took it to shop...ran good for a week or so then same thing...bought new pump and drop tank...same thing cut in hose and clamps fell off...those cheap plastic ones...install some spring clamps replaced hose...didnt even replace pump and returned after a month...been running perfect for 3 years...now im working on my 95 tbi this what brought me here...trying to figure out my problem

@ScannerDanner Год назад

I can help for sure! Let me know if you have questions. Just reply here whenever. I get all notifications

@randomugliness1238 3 года назад

Love these trucks! I just bought a 93 K2500 and learning about TBI through doing! Thought at first it was carbureted and I was like "Uhhh are those injectors in the throttle body?!"

@journeymanautollc9463 3 года назад

Would that truck happen to be for sale? i may be interested if the miles are as low as Stated in the beginning? Thanks!

@ScannerDanner 3 года назад

No sir 😔

@billthrasher3587 3 года назад

common issue on old tbi gms. clogged filter most likely

@Aventuras_en_Moto_Hn 3 года назад

7:29 $5,000 bucks scanner throw... :/.....I wish I had one of those

@petar443 3 года назад

Will a fuel pump DC motor burn or short , if it has lower supplied voltage for a continuous period of time ( like a voltage drop because of corrosion on fuel pump connector ) ? I've been told, that a dc motor pumping at lower voltage than the voltage it's design to work for, would make the motor work harder. Just like a motor that has excellent supply and ground , BUT has to work more due to restriction(clogged filter or line)

@petar443 3 года назад

i'm asking this, because i have vehicle that i changed the fuel pump motor 4-5 times.And everytime the motor shorted in a couple of months. Finally i installed Bosch pump motor and this time the fuel pump connector melted. Soldered new connector, put whole new pump this time , and no problems 2 years after the repair..to this day i think the problem was voltage drop at the connector.

@mgrindstaff1 3 года назад

Duck donuts…..thought I was the only one lol

@vickenkaragozian2041 3 года назад

Good fuel amperage on TBI is about 4 amp. If its less then check grounds & power to fuel pump. If everything is ok then the fuel pump is bad.

@ScannerDanner 3 года назад

3.4 amps was close to 4 😉 I would say that fuel pump current measurements are "a test", not "the test" if that makes sense. I've never condemned a pump based on amperage alone. Too many variables imo

@80sfordguy 3 года назад

That’s a bad pump with customer getting quoted for a complete pump assy, they want the pump by itself they can do it. Shops don’t have time to tinker with assemblies when the assembly is easier to obtain. It’s a far quicker as well as labor effective and customer cost effective way to repair the vehicle and get it back on the road. Don’t like that that’s fine, many stores or websites sell tools, parts and service manuals for DIY’ers to do it themselves. Shops are there to quickly & accurately diag the problem and upon customer approval complete the repair correctly an in a fair timely manner, not to penny pinch for the customers benefit that’s the customers job if they want to be cheap.

@ScannerDanner 3 года назад

Exactly, especially on today's FP motor set-ups. I'd never piece in just the pump, even though you can find the motor itself using some cheap ass online parts. It gets the entire assembly or it doesn't get done. Im not dropping the tank again, for free, when your janky ass part doesn't function properly 😉

@arbez.nation 3 года назад

Love the ending. Hoping for a duet...

@indica_dogo868 Год назад

Hello, and thank you for all your time and information you share. So when you deadhead test the pump. If the pressure would have gone up to 20psi. Would that have ment you have a fuel pressure regulator problem?

@ScannerDanner Год назад

Yes!

@terryharvey4811 3 года назад

OEM GM FILTER 13/16 AND 5/8 WRENCH, Many aftermarket filters 5/8 and 3/4 wrench. If they replaced the pump they should have used the new hose that came with it AND a new sock. One of my customers 350 TBI's had 9 osi but no power, fall back on hills, volume test was less than 4 oz, when it should have been 8 oz. First time I ever had pressure and not enough volume on a low pressure pump.. Sooo....if your TBI does 70 MPH downhill and 20 MPH uphill do a volume check..Just because the pump runs and has spec pressure does not mean it's good...

@ScannerDanner 3 года назад

terry, this is actually very common. To have psi and not the volume, once demand increases, then you will see the psi drop. This is why you ALWAYS test fuel pressure on a wide open throttle snap for these suspected conditions. And if you can't catch it there. The 02 sensor readings at wide open throttle will be your best friend. I never check fuel volume, but you are correct about it and nice job on your find on that one.

@2752rang Год назад

You guys are really cool and right to the point

@michaeldennis3240 3 года назад

Dan can I ask you what would cause my fuel pressure to increase from 55 running and apon shutdown it jumps to 61 and holds for what seems like way to long? I've been having a no start issues on my 1996 5.7 suburban but "only when hot"? It starts fine in the mornings and winter. No codes at all either. Distributer modual? Pressure regulator not relieving pressure? I'm stumped so far! Thanks man!🤙

@ScannerDanner 3 года назад

this is normal, when you shut it down, you lose intake vacuum. When there is no intake vacuum, you will have higher psi (same as wide open throttle). Also, you absolutely want pressure to hold on shut-down! There is no such thing as it being held too long. The important thing to do for your situation is to check the fuel psi DURING the no start. If you are sitting at 61 (or anything above 55) while you are cranking and it is still not starting, you are barking up the wrong tree. Check it for spark and injection pulse too during the no start.

@michaeldennis3240 3 года назад

@@ScannerDanner Exsactly what I've been thinking recently! Your awesome thanks for the reply and advice!👍👍 Cam shaft position sensor i believe!🤙

@obsoleteprofessor2034 3 года назад

I helped my nieghbor change his S-10 pump. We pulled the bed off. Turned out to be a bad ground at the frame...darn.

@ScannerDanner 3 года назад

Always test the powers and grounds first 😉

@jdtractorman7445 3 года назад

It's too bad that system is not designed to hold pressure with the key off. If it was, you would know just from a pressure test more than likely where the leak down was, if no external leaks present😁.

@ScannerDanner 3 года назад

Just remember that a bleed down does not cause low pressure in most circumstances.

@haluke101 3 года назад

Napa parts better then any aftermarket parts Napa knows who wow who yeah yeah

@mutley203 3 года назад

Hi Paul I am a retired mechanic in Dover England,in 1990 i had a fuel problem that only happened when I road test the car up a steep hill,it turned out to be a split pipe like the one in your video.it was on a Vauxhall cavalier the only time in 50 years of working on cars.look up jubilee way Dover England to see the White Cliffs of Dover bridge that helped find the fault cheers

@markferraro5250 3 года назад

Great job SD. truck brings back memories code 44

@ScannerDanner 3 года назад

yes!

@nedhirdouiri 3 года назад

When measuring the RPM , is it always 8 humps ?! Or it depends on the fuel pump design ?!!

@ScannerDanner 3 года назад

Most are 8, some are more

@jonclark1288 3 года назад

Regular cab, long bed, base V6 engine, 2wd, ugly diamond plate running boards (despite being a 2wd and already relatively low to the ground), and a cap over the bed...yep, that's the quintessential Grandpa truck. Not a chance the owner is less than 70 years old.

@hightttech 3 года назад

SD, you are so right. If the fuel filter is puffy-cheeks plugged on a return system, try to sell a fuel pump too. I've seen so many FP fail shortly after clogged filter, and it's annoying for customer. Not as critical on RETURNLESS system, i suppose due to system always dead headed.

@SGTECH-di9df 3 года назад

At 19:55 you said not to stack the grounds, why is that? Does it effect the measurement?

@ScannerDanner 3 года назад

It does not. The dangers would be if you dropped it with all of those stacked grounds. Make sense?

@UcantBeSerious03 3 года назад

31:43 - I think he forgot that was a piece of hose and trying to operate the carb. By far my most fav channel.

@TonyRule 3 года назад

13:09 So you're blowing it and it spits back in your face... that's what she said.

@ScannerDanner 3 года назад

🤣🤣🤣

@thebudcat1861 3 года назад

Gates has submersible hose for this application. Had pump problem on 87 Camaro found hose connecting pump to sending unit was laying in bottom disintegrated.