Will A Diesel Fuel Cooler Actually Give You Better MPG? Duramax / Powerstroke / Cummins 

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You are the reason I bought a diesel Now I want a camper

Yep, I have to see the results!!!

Ports to the top to prevent air locking in the cooler.

I can wait to see the results man! I know you live in Michigan, like myself. I work in the fuel industry as service, servicing, repairing, and building fuel stations. Be very careful putting additives in the winter blend fuel. We see it all the time, in witner, with stations adding more additives to try and help their customers, and end up clogging up their dispensers and motors. Just wanted you to be aware. Keep up the great content bro!

The first half of this video was spent talking about all the places that the fuel gets hot going from the engine to the injector pump (trans, engine valley, stock fuel filter etc. Cooling the fuel in the tank doesn't stop the fuel from accumulating heat on the way to the engine next time. The point is to have the fuel as cool as possible going into the injector pump. I have a trans cooler for the fuel on my LBZ that i put on a few weeks ago due to excessive fuel temp towing this last summer. I routed mine before the cp3. My fuel goes from the tank to the airdog, then the stock fuel filter, then the fuel cooler, then the injector pump. I have only driven a few miles, but I did notice the MPG seemed to be higher on the way home from the gas station, and power seemed to be up as well. Fuel temp readings at the fuel rail were about 20-30 degrees higher than the temp outside!!! I plan to update this with better information after towing with the new system. I was only hoping for better cooling for CP3 and injectors. If i can get more power and MPGs that is just an unexpected bonus.

Really good content, I've got an LBZ in an 05 Suburban I'm using to take the family on road trips. I would love to improve the MPGs! Keep the content coming!

When I swapped out my original fuel filter mount for an aftermarket one. I made a heat shield out of an old road sign aluminum. I made it wider, and longer than the fuel filter. I gave it an approximate 45* bend at the bottom. I also raised the filter head up about 1” bolted the heat shield to engine mount. Bolted the fuel filter head to the head shield above that. It has to help some.

Should have rerouted the air dog return to the factory fuel cooler and run the return fuel from the engine to the ppe cooler….still dual coolers but the hotter fuel will get the more efficient cooler….right now you’re basically running how it would stock because the air dog return normally isn’t there

Would love to see an HHO kit installed on one of your trucks to see if you experience any gain in HP and/or fuel economy, or to prove that it just snake oil.

My LBZ came with one, under the bed sprang a leak when I backed over a stump, buddies older Duramax had one too and it leaked too Horribly the fittings that go to the lines rot out. Never thought about upgrading the fuel cooler looks sweet

Definietly looking forward to the update on this mod here 🎉🎉

Love that you are doing this going into the cold season in Michigan. My first thought was gelling issues. We had a really bad cold bit around Christmas last year and even with double anti gel additive I still had my lift pump gel up. :-( Look forward to seeing your results.

What about just adding an electric fan to the stock cooler?

A temp gauge on the return would of been a nice comparison of fuel temps before and after

My hydraulic firewood processors use a fluid cooler that has a 12 volt fan on it. I have been thinking about putting one on my LMM since I have a 52 gallon Titan tank that pretty much blocks off the factory fuel cooler. It could be mounted anywhere since it has a fan on it. Central Kentucky Duramax driver since 2002

Mate I drive and tow a 4 tonne caravan (camper) over in Australia in 75 + degree and wondering how that fuel cooler worked. Thinking of getting one fitted and checking out the economy….Cheers

Looking forward to the results on this test. I don’t feel like you will get as much benefit from this during the winter months but it will pay off in the summer months. Waiting on the results from this to see if I should try it. I was thinking of buying the PPE transmission cooler, using it on my transmission, and using the old transmission cooler to cool my fuel.

Happy Thanksgiving from my family to yours!

Hope this mod works out good for you! Hopefully the gelling wont be to big of an issue!

Your l5p runs much cooler fuel Temps that my lb7. Last time I looked at mine with the truck at operating temp it was a touch under 100 at like 25 degrees outside. So the l5p is already ahead of an lb7 in that aspect

Very interesting another great informative video from one of the best on you tube

Been watching you for awhile now and was curious if you had a updated LB7 parts list you would recommend. I got a 2001 lb7 and would like to start building it but dont know where to start.

Yup...i was gonna mention that old post on the forums

I feel like it would be lower if u wasn’t towing something but ofc u were testing its limits but to me I feel like it’s worth it lower temps is always better overtime

Hey truck master love the content tonight. Very interesting idea…hey what kind of drill bits do you use? I just found some pretty great bits at a company near me called KnKuts. Made in America and I can’t wait to try them out.

Look into the 6.4 powerstoke fuel cooler it’s a pretty interesting design

I’m not sure what normal fuel temperatures are on a LB7. I didn’t know my CTS3 gave me the option to see my fuel temperature. I added a large cooler behind the grill. My fuel filter has a heat shield, and I raised it 1.5” up off the exhaust manifold. My fuel line runs from the filter to the cooler, and from the cooler to the CP3. I know before touching the fuel filter it was way too hot !!! After all this my temp was 120* yesterday and it was 40* outside. I guess time will tell and I’ll see when it gets hot out.

Love these videos!

I came back to see if there was an update on the fuel cooler. Any update?

Do you have any data on if this helped? Do you need to bypass this during the winter?

howdy truck master.:: i would like to know if that same set up of ppe tranny cooler for fuel cooler would also work well for 2017 to 2019 duramax L5P???? opinion ?

@truckmaster do you use a fuel heater on your air dog lift pump with the cold temps in Michigan? I live in Northern Illinois and wondering if it is necessary. I have a FASS lift pump on my LML.

Doesn't B&M make a trans cooler with a built in fan that would nelp with air flow?

Caterpillar training program has proven and teaches. Every degree lower or higher egt’s go up and down 3 fold . 20degree up or down on fuel temp equals 60 degrees up or down egts. It’s all interesting and it all helps.

I’ve considered a much larger/ better cooler in the factory location, but adding an electric fan to it.

Updates?!? This is killing me 😂

Bro it’s 🔨Time !🎶💪🤠🤙

First HAPPY THANKSGIVING to you and the TRUCKMASTER family. This is agreat little project experiment. It certainly makes sense that it will make a difference. Wonder how / if a person could route a forced air duct to the stock cooler as well ? 🤔... Back years ago when I was a young hot rodder. We ran the fuel lines (gas). Through a small ice cooler and into the carburetor. Cold fuel and cold air atomized more efficiently. Resulting in better horse power and cleaner burning efficiency. Which if you think about top fuel drag cars running alcohol which is far cooler than gasoline and far more efficient. Now I might be wrong. However if memory serves me right. Bully Dog use to have a system that misted water and it was kind of the same idea to cool the fuel and provide a better atomization mix of fuel and air. Which also prevented knocking. But that was many years ago. Will be interesting to see how this turns out. That large cooler should make a real difference. Be interesting in winter temperatures and summer temperatures running down the highway. If a guy got really mechanically geek about. You could add a small electric fan and switch for use in stop and go city traffic during warm weather. The difference with diesel being compression fired. Vice spark fired like gas. Means you can work with the return side and not worry about the delivery side. Gotta love this stuff... good luck and have fun. Looking forward to seeing the results. You and PPE and RDS might be onto something here... 🤔 🤓👍

Watching now…still within the first 5 minutes. Curious if you installed an electric fan on the fuel cooler if it makes a difference? I mean, a bunch of other coolers benefit from e-fans. Looking forward to seeing what you find. Staying tuned 😂😂

Dumb question, my lb7 came factory with one did they stop putting them on after the lb7?

My problem is with the cold winters in Wyoming trying to keep my fuel filter from jelling up I need heat not cold it put a fuel heater on my pump but when it's 20 below it blows the pump fuss before the heater can warm up the fuel filters I could put a switch to turn off the pump and let the heater warm things up but by the tie it heats the filters up the batteries will be dead I belive running a larger micron filter in the winter would be a better idea ,I have the oil pan heater now I put it on the filters for an hour before I start the truck it seems to work get the fuel flowing through the filters I've tryed the fuel additives they don't work and our fuel has winter time additives already I've built an isolated blanket to go around my filtersthey say that will help we will see maybe if you lived down south that would work but Wyoming it's snow and cold 9 months out of the year once I get the fuel flowing the pump heater should keep it warm hope hope hope

any updates so far on this..im looking to replace my leaky fuel cooler and trying to find an aftermarket better style...

So what happened to your factory fuel cooler down by the fuel tank?

I maybe wrong, but why the improvement in the return side, if you have a small steady stream of fuel going back into the tank, in theory it should absorb the tempurature of the tank fuel. It would seem more prudent to cool the Cp3 fuel supply side prior to going into the injectors. Maybe I am wrong about this, but the atomization process occurs at the injectors, not at the tank. I don't understand how a small stream of hot return fuel will effect about 30 gallons of ambient fuel.

If you put that big cooler in front of your ATA, a/c condenser does it raise your intake air temp?

Where’d you get your front bumper at?

Is your fuel cooler installed on the fuel return to the tank or on the efi system inlet 🤔

I’m interested in better gas mileage. Good going.

happy thanksgiving, sir. may God bless you and your family to have a great holiday. • i do have a question…i’ve heard from a buddy of mine, who has a ‘03 lb7, that if a duramax is deleted, there is no block heater. is that true? the specific truck i ask about is a ‘06 lbz. there is a plug & cord zip-tied just outside of the passenger side exhaust manifold. is that the block heater plug ?

Is there any horsepower and mpgs gains from running air dog or fast?

@TruckMaster I’m looking at a 03 duramax with the lb7 do you guys do jobs for customers with injectors and motor builds or just your own stuff? Where are you located?

Truck Master i have a question on my 2015 lml .....i bought it and the mechanic told me not change the trans fluid....if i did it it could ruin my trans........how much of that is true....?

First from Comifornia, I mean California!

If you have an Airdog II 4G, I don’t think it will work. The return hose on my truck barely returns any fuel at all. The newer lift pumps just recirculate the unused fuel in the pump itself instead of returning it to the tank. The only reason it still has a return line at all is for air and foam to escape.

I really wanted to support the Chanel bc I’m getting an air dog for my 7.3 powerstroke but you don’t have it in your website so I’m sorry lol

Any results?

First from TX!

I found you an lly s400 kit

First from VA!

That trans cooler can handle a lot of pressure. Why don’t you hook it up to the engine side of the air dog. This will cool it before it hits the cp3 and injectors. The air dog should have no problem feeding the engine what it needs through the cooler. This being an experiment I think you should at least try it. I have a 03 suburban with an lbz and an RDS 64mm. I need some mpg help.

i wish you had tshirts in stock so i could get entered

I just pressure washed off the fuel cooler yesterday on my LLY and man oh man there was a lot of stuff coming out...

First from GA!

Can this mythed work on gas powered trucks?

RIP Mike L.

First from Colorado

Josh did u have to reprime fuel system.

First from OK.

Can’t imagine how that would work in sub zero temperatures.

No results 😂

Mike L built my transmission

Cooling diesel fuel will actually be less efficient.

First from nc!

have u tryed meth injection?

Your l5p runs much cooler fuel Temps that my lb7. Last time I looked at mine with the truck at operating temp it was a touch under 100 at like 25 degrees outside. So the l5p is already ahead of an lb7 in that aspect