Replace 31 gallon tank with 39 gallon tank from 2500 series Suburban?

Not too happy with the MPG/gas tank size in my 2013 Yukon XL. When it reads empty, I can only put in about 25g and it is a 31 gallon tank. Something is off.

Possible to swap in the bigger 39 gallon tank from the 2500-series into my 1500 Yukon Denali XL? What models carry the 39 gallon tank? what years of Silverado/Suburban/Yukon XL?
Can I assume the mount points are the same and can it work?

I also want to put in a newer fuel pump because this one has 200K on it and is original, to preempt failure.

dictum said:

Not too happy with the MPG/gas tank size in my 2013 Yukon XL. When it reads empty, I can only put in about 25g and it is a 31 gallon tank. Something is off.

Possible to swap in the bigger 39 gallon tank from the 2500-series into my 1500 Yukon Denali XL? What models carry the 39 gallon tank? what years of Silverado/Suburban/Yukon XL?
Can I assume the mount points are the same and can it work?

I also want to put in a newer fuel pump because this one has 200K on it and is original, to preempt failure.

Click to expand...

The 2500 Suburbans have a dual tank setup (with a fuel pump/sender in each tank). The auxiliary tank is like 7 gallons, and main tank is 30 gallons(?)

The system is kinda more complicated because you have an extra relay for the auxiliary tank, there's extra wiring and it's tied into the cluster for the fuel level (via the Class 2 data bus system or whatever that thing is called?)

If you study the wiring diagrams, I'm sure it's possible to swap the dual tank setup. I can't remember if HP Tuners has any sort of settings to enable dual tanks on the ECU side of things...I can check.

@swathdiver I believe that it was determined that the 2nd tank would not fit on a GMT900 1500 frame, the 2500's use the gmt800 frame
but just going off of memory, james should have more info

Is there an aftermarket single tank? You mean to tell me that 2500 Yukons /Burbs have dual tanks also? Is there a single 40-gallon tank in the GM lineup which would fit in the 2013 Yukon XL?

dictum said:

Is there an aftermarket single tank? You mean to tell me that 2500 Yukons /Burbs have dual tanks also? Is there a single 40-gallon tank in the GM lineup which would fit in the 2013 Yukon XL?

Click to expand...

Never heard of one, doesn't mean they don't exist though, with as many times as people have tried to even buy a new gas tank it would have came up by now.

Have you ever ran it completely empty and see how many gallons it takes to fill up? My mom had a mid 00's grand cherokee and although she didn't have live to far from her work (roughly 5 miles) she would drive that thing when it said 0 miles to empty for 2-3 days along with other errands.

Me, after 2-3 hours in any vehicle I need to get out, stretch my legs, and drain a different tank.

once the low fuel light comes on you should be able to toogle thru the dic and find a menu that shows the remaining miles, run that down until it just says low then you should still have 3-4 miles. then fill it up. about the most mine has ever taken is close to 30 gal

dictum said:

Not too happy with the MPG/gas tank size in my 2013 Yukon XL. When it reads empty, I can only put in about 25g and it is a 31 gallon tank. Something is off.

Possible to swap in the bigger 39 gallon tank from the 2500-series into my 1500 Yukon Denali XL? What models carry the 39 gallon tank? what years of Silverado/Suburban/Yukon XL?
Can I assume the mount points are the same and can it work?

I also want to put in a newer fuel pump because this one has 200K on it and is original, to preempt failure.

Click to expand...

My fuel sender is like yours, I can drive all day when it says empty. Typical fills are 25-26 gallons, most ever was just under 30.

The 2500s have a deeper frame, they run a 26 gallon tank up front and an 11 and change gallon tank above the spare tire. It's too big to put in our 2500s without removing the spare and crossmember, not to mention the complex computer programming to get everything working as it should.

Gasoline fuel tanks are considered part of the emissions system now and the aftermarket won't touch it with a ten foot pole because of the feds.

Some company made a round fuel tank that took the place of the spare but getting that fuel into the main tank was cumbersome.

The GMT400s had a 42 gallon tank behind the rear axle, their spare rode in the back of the truck.

On the highway my truck burns about 4-5 gallons per hour between 70-80 mph. That's over 7 hours at the slower speed and just shy of six hours at the faster speed. We routinely run about 450 miles on a tank using 25 gallons. Furthest I've run on 27 gallons was 515 miles. She can go further than I or my passengers can endure. That reality caused me to abandon my quest for more capacity. If I really need more capacity, I've got six 5 gallon Wavian Jerry cans that can go in the back and won't stink up the interior.

With VVT, your truck ought to be more fuel efficient than mine by a solid 1 mile per gallon.

My 09 Esky had the same issue. The cure was replacing the fuel pump, sender, carbon canister and the evap module along with blowing all the loose carbon pellets from the lines and wiping them from the tank when it was out.

It now fills up to 31 gal when the gauge says it’s at its lowest without clicking off at the nozzle.

I looked into a bigger tank for our 1/2 T chassis because I run e85. It slightly decreases milage. There’s no larger capacity tanks currently made for our chassis.

I looked into the dual tank set up the 3/4 & 1T trucks but there’s a space confinement issue that can not be resolved. I can say that getting the fuel sender fixed and the ability to fill up the tank all the way did resolve a lot of milage issue.

Yeah, I was going to say look into the GMT 400 suburban tank that had the spare tire inside the trunk. But I don't know if those would work with the newer fuel pump assemblies?

Otherwise maybe a truck fuel tank that had more capacity? Again, the spare tire would need to be removed to make room for it. Usually on the trucks the long beds (8') had the largest fuel capacity offered. But agree, those trucks are usually the 2500HD trucks. Maybe a 1500 extended cab 8' bed truck fuel tank?