Updated Onan Marquis Gold 5500 Generator How Stop Carburetor Surging Without Removing Carburetor 

After watching your video I broke off the tabs and made a less than a 1/4 turn counter clock wise and it fixed the surging completely. Thanks for your help.

Thanks a lot!!!! I took mine apart cleaned it put it back together ran for about an hour then same 😢 On our way to cold weather, and really needed to run ! Your video gave me sudden hope? One full turn after I broke the little plastic nipples and boom runs like a top! Again 1 million thanks, great video !!! This is only the second time I’ve ever left a comment on anyone’s video ever .

The Best Technical channel for RV’s. Great video

Also i purchased a $380 carb on Amazon, and it worked ok, i took it to cummings and they pointed out how it was not a Onan, the $550 Onan Dealer has so far worked the Best, but i do keep a $60 carb for a emergency

Great stuff! I recently bought a 2008 grey hawk with only 7,100 miles and 36 hours on the Onan. The Onan was a no-start. I can see your brain spinning now. I removed the float bowl. Wasn't really bad at all. I cleaned it out and sprayed the main clean, and opened orifices up and... More over... freed up the fuel shut off solenoid plunger. It was completely stuck. Started right up after that, It does surge when not under a load, so i plan to do this adjustment and clean the needle end there. Thanks so much!

EXCELLENT video. Truly one of the best I have seen. Thank you for sharing your knowledge with those of us who are still learning.

Thanks again, you saved me from having to spend money having to take motorhome and generator in for repair!

Tried this today and worked just like the video showed. The only thing I did differently is that I used a Dremmel tool with a cut-off wheel to cut the tabs off leaving the black plastic with which I can turn by hand and without having to remove the bowl drain bolt. Thanks for the video!!

Awesome video Kevin! You're the best!!!

Grateful for your time and knowledge. Very easy and extreamly detailed. Was able to fix issue in no time. Thank you once again sir.

I just put a new Cummins fuel pump ($242) and Cummins carburetor ($580!) on our 5500. I also added new fuel lines, adjusted the valves, new air filter, changed the oil, and new spark plugs,. Runs like a champ now!

I have learned so much from you and I am truly grateful.

Finished your vid. VERY, VERY informative. Thanks Jeff. Steve

Kevin, your video by far is the best on the internet. I was hoping you may help me with my gen issue. I have an Onan 5500, 82 hrs. It sat with old gas for many months. So far I’ve: - removed the carb and cleaned it -removed all old gas filled with new -ensured fuel pump is pumping and pumped out old fuel -ensured spark plugs have spark Reassembled but it won’t start. It appears to be getting flooded with too much fuel. Funny thing is that when I drain the float bowl, don’t prime it, the gen starts like normal for a few seconds but then dies with a 36 fault code. This tells me that the float and shut off needle isn’t functioning allowing too much fuel in the carb. Any ideas? Thanks

Thank you 👍🙏 worked for me

Thank you!!! Worked so well on my 4000 onan generator. @ full turns was too much for the 4000 but 1and a half was good.

very helpfull video,THANKS!

Very good info. While we are here, what spark plug do you run in your unit? Thanks Buddy

Worked great for me after much frustration with surging and stopping. A very thin blade and very gentle prying pressure under the tabbed portion of the knob, turning the knob a little with each pry , had the knob off intact in about 15 seconds. No need to cut or disassemble anything. Thanks so much for the informative video. Your advice was spot on.

This worked for me, thanks

Taking possession of our 21 year old, "New" RV next month. Good to bone up on maintenance issues. Thanks for posting your video so now, we're all informed on this issue and how to fix it.

Dumb question.... Did you try carburetor cleaner or Sea Foam first? Great info!

Great video well presented the process of adjusting the RPM and HZ Thank you

THIS IS HOW I FIXED MINE, IN THE CASE OF.... "I CAN'T START MY GENERATOR" It's has been two years since last time it was running, so I started by checking oil level full at gen dipstick (it won't start if low oil because of sensors) then I checked gasoline more than 1\4 tank in the RV (also safety sensors), sparkplug checked for good spark, also checked the manual reset circuit braker ( to be ON) at front motorhome engine compartment for 12v current to the generator to be able to start it, also cleaned the carburetor and even installed new one but same situation, then checked wires and found some has been chewed like gum by rats at the back of starting switch generator panel so I replaced them, at this time the generator started but stay running only by keep pushing the switch on all the time, so then finally I knew it was internal electrical problem from the engine itself, so I took the generator out from my RV to work in my garage, (I did this by myself with some tools and old Mayan tricks ) lol, it's really heavy for one person. I disassemble the unit at my garage and started by removing the cover, then the cooling fan or flywheel unit (it's 2 items in one) until finally I was at the gen rotor and brushes assembly area and this is what I found: one more wire chewed by filthy rats plus the stinky rat nest in the middle of the generator motor coil, I fixed the wire and sanded the commutator copper contacts where the brushes are sitting becouse they were real duty with old urine from the rats, and of course I got rid off the stinky nest, lol!!! Then I assembled everything back together and... bingo it's runing like a champion!!! For this project materials involved was about $60.00 including an aftermarket new carburetor and an harmonic balancer/steering wheel puller (available at any auto parts for $25.00) to pull the aluminum fan out and (flywheel). Just picture this: (Any gasoline engine run smooth if gasoline and DC current aren't interrupted) so following this important principle you'll always find the problem to be fixed. Also if you have a onan microlite 4000 like mine, don't run it for more than a minute without the cover because you'll cook the engine real fast, also keep the eye on the aluminium fan and your fingers after cranking it in case you missing one or two members...just kidding, lol!!! After testing the gen with the help of a gasoline container, a piece of hose and 12v battery, I did put the air cooling assembly back and the rest of components including the cover, then it was ready to be installed at my RV. Once the gen was installed back at my motorhome I started it to be tested for 120v electricity but not before flipping the AC circuit switch (on) at the gen starting control panel (sometimes hiding under or around the panel) to be able to transfer power to my RV GFCI main outlet and electric panel as well, my motorhome it's equipped with GFCI so I reset it and tested for green led light indicating power is ready at my main breakers panel, so I turned my main breaker (on) along the others ones but no power was present at my breaker main switch (faulty main braker) so I flipped it many times, sometimes you can make it work again, mine did work, lol!!! I'm happy because everything works now including the refrigerator for cold drinks and AC for this crazy summer, lol! Later I'll buy me a new main braker, for now this is a resurrected generator story that needed to be shared. If this can help eaven one person to save time and $$$ it'll make me more happy, thanks for reading!!!

Great video Kevin! Well...I'll tell ya, you are really keeping me busy with (fixes/check see's) on my Workhorse 🤣. Love your information...thx again !! Scott

Nice video I just bought the 5500 my 5.5 HGJAB-6755 and the altitude adjustment only goes from 0- 5000ft I live that 5879ft and camp 1000ft it will not run at 1000ft. So do you think the adjustment screw the word generator? It only has 7 hours.

A nine minute phone call from Kevin and my Onan 5500, that has been giving me fits, was repaired. 6 of those nine minutes was spent gabbing about our shared IT background. Thanks a ton Kevin!

Thank Kevin, Even tho Mine is a Emerald I adjusted the Altitude (needle valve) on my unit, it immediately started purring like a kitten!!!!! Thank You!

where can i buy a new elevation adjustment jet buy itself

Thanks!

Thanks for these videos, very helpful!

Hi Kevin, I had the same surging problem and I have the Onan 4000, I made the same modification to the rich/lean screw to make mine fully adjustable as you did. It worked great and half a turn out from factory and it smoothed out. I am in Colorado so I am right at 5000 feet of elevation. If you get a chance show us how to properly adjust the choke. Thanks for the video, very helpful.

Why didn’t you just clean the carb?

Your video helped me fix my surging engine. Te plastic part has a slot built into it and if you put a sotted screwdriver in it and twist, it comes right off.

Well Kevin, this was another good fix and view of the Carb. I love to see the exploding views you show form time to time. Look forward to the next one.

Kevin, Thanks so much for sharing all your knowledge.

Next time, take two small flat head screwdrivers and pry the cap off very carefully.

You’re the man Kevin!! I’m sitting here in Florida with my generator running thanks to your help. Thanks so much ✌🏼

What a great video. Excellent, thank you. I'm having the exact same problem. I'll give it a try.

Good afternoon. Great video. Tell me where you can see the catalog numbers of spare parts?

Much appreciated for this video. Very helpful

YOU ARE A GENIUS !! TOOK 5 MIN, RUNS PERFECT USED A DREMAL TOOL TO CUT THE PLASTIC TABS OFF THE CAP.....

Always enjoy your videos, but the volume is many times very low.

Hey Kevin, just wanted to say thank you. I just did this on my generator and it runs great. Headed out on a hunting trip is weekend and really don't have time to clean a carb. 👍🍻

Attn, everyone that makes how to videos, this is exactly how to do it, details are so important, thank you so much for the video also.

Fixed my issue. Thanks. Easy.

Awesome Video Thank you soo much for taking the time to produce this video.

You are da’ man. I followed your instructions and thanks to you, I now have a smooth running Onan Marquis. I only lack checking Hz to make sure it’s fine tuned in! Thank you, thank you, thank you!

Mine is flooding out of the carb And the motor won’t start..

I have a onan 2800..could this also work on it.mine realy surges..Sat for years..

Isn't that more of a fuel screw than a main jet?

Great video I just put a new carburetor on my own generator the old one has been setting for 3 years the new one is surging I will give this a shot I'm at 7500 ft could be the problem of course I will be cleaning the old one and tinkering with it before I attempt on the new one But the old one was doing the same thing as the new one so I think it's an altitude problem I don't know

Excellent video!!

Thanks

Have you ever seen the belt under the bottom

Not bad, not bad. But you should not touch fuel mixture screw to change frequency.