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Extended-range tank for Chevy 2500HD gas

mkirsch
Nomad II
Nomad II
With my 2015 Chevy 1500 being down, I have been driving my Dad's 2015 2500HD.

Pretty sure the stock fuel tank on the 2500HD is 34 gallons.

It takes 20 gallons to fill it at 1/2 tank, AND the fuel tank looks like it's hanging down lower than I think it should, which has me wondering if it has an aftermarket extended-range tank on it.

Of course I'll chalk it up to my overactive imagination if nobody ever made an extended-range tank for these.

So, did anyone make an extended tank for the 2015 Chevy 2500HD gas? Yes, I have checked google and Titan's website.

Putting 10-ply tires on half ton trucks since aught-four.
8 REPLIES 8

Grit_dog
Nomad III
Nomad III
You ever solve this great mystery mkirsch?
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold

monkey44
Nomad II
Nomad II
My 2015 Silverado 2500HD 6.0L SB 4x4 bought new came from factory with a single 36 gallon gas tank.
Monkey44
Cape Cod Ma & Central Fla
Chevy 2500HD 4x4 DC-SB
2008 Lance 845
Back-country camping fanatic

ZagiFlyer
Explorer
Explorer
I have a 2500HD with a standard bed (6 1/2 ft) and it has a 26 gallon tank. I know the long beds come with larger tanks. I also know that the aftermarket larger fuel tanks for standard beds hang down below the frame rail (which is why I don't have one).

So . . . if the truck in question is a standard bed then you probably have an aftermarket tank. If it's a long bed then you probably have the stock tank.
  • '23 Ford F350 diesel
  • '24 Arctic Fox 29-5T

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APT
Explorer
Explorer
The stock tank is 36 gallons so about half at 20 gal seems right. Most of my vehicles fuel gauges are not linear meaning at half a tank indicated is less than half tank left. Nothing to worry about running it full.
A & A parents of DD 2005, DS1 2007, DS2 2009
2011 Suburban 2500 6.0L 3.73 pulling 2011 Heartland North Trail 28BRS
2017 Subaru Outback 3.6R
2x 2023 Chevrolet Bolt EUV (Gray and Black Twins)

Bionic_Man
Explorer
Explorer
It is pretty unusual to find an extended run tank for gas.

FWIW, both my RAM and my Grand Cherokee run further on the top half of the tank than the bottom.
2012 RAM 3500 Laramie Longhorn DRW CC 4x4 Max Tow, Cummins HO, 60 gallon RDS aux fuel tank, Reese 18k Elite hitch
2003 Dodge Ram 3500 QC SB 4x4 Cummins HO NV5600 with Smarty JR, Jacobs EB (sold)
2002 Gulf Stream Sea Hawk 29FRB with Honda EV6010

Grit_dog
Nomad III
Nomad III
Crazy idea, but couldn’t you find out by running it down near empty and presume the gas gauge is correct if you’re putting 30+ gallons in it compared to 40-50+ if an aftermarket tank?
Hell, you could carry a jerry can and just try to run it dry if it’s really a need to know scenario.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold

Latner
Nomad
Nomad
I don't know all the specifics, but the reason for 36 gallon tank and nothing larger has to do with Vapor emissions regulations, it gets pretty expensive to get them certified.

monkey44
Nomad II
Nomad II
We drove a Chevy 2015 2500HD SB gasser for years, hauling our truck camper. Bought new, no added tank. Stock tank - 36 gallons.

The GM - 1500's sit too low to the ground for a tank larger than 26 gallons. I drove one for years, and tried to find a A/M larger tank, but nothing for gassers, only larger tanks for diesel fuel and mostly in the truck bed.
Monkey44
Cape Cod Ma & Central Fla
Chevy 2500HD 4x4 DC-SB
2008 Lance 845
Back-country camping fanatic