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Zac Davidson
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Another JR Senior Enthusiast

Another JR

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Posted

The whole reason for the smaller tanks on some models is limited space (length) for the fuel and DEF tanks. Maybe someone with a 36 gallon diesel tank can measure the length of their tank and post it so you can compare. I can’t do it because I have a gas truck. 

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redwngr
redwngr

All HD AT4's (and denali's) are crew cabs.   All HD crews have 36 gallon tank (cab and chassis trucks excepted)   HD Double cab std box diesels are 29, gassers 36. DC long box are

Crazy Canuck
Crazy Canuck

I feel if he hasn't figured it out in the 6 years since he posted it, he probably never will lol

sdelam
sdelam

My 2500 CCSB Denali Dmax has a 36 gal.  

nards444 Senior Enthusiast

nards444

Posted
Posted
21 minutes ago, Another JR said:

The whole reason for the smaller tanks on some models is limited space (length) for the fuel and DEF tanks. Maybe someone with a 36 gallon diesel tank can measure the length of their tank and post it so you can compare. I can’t do it because I have a gas truck. 

 

Maybe but thats not what people are thinking or saying.  I have a crew cab standard bed,  spec says 36 gallon,  build sheet says 36,  ive never been able to get more than 29 gallons in. 

newdude Senior Enthusiast

newdude

Posted
Posted (edited)

Just remember.  This decrease in certain diesel tank sizes (reg cab and DCSB) all happened because the GM truck world complained about the DEF fill and tank location.  Then the bright engineers decided to shove the DEF tank directly in front of the fuel tank, leading to those two configs getting smaller fuel tanks. 

 

Should have left it outside the frame rail with a shorter and longer tank (to keep clearance good) and put it on the driver's side of the truck so they could still move the DEF fill port where they did.      

Edited by newdude
redwngr Senior Enthusiast

redwngr

Posted
Posted
1 hour ago, nards444 said:

 

Maybe but thats not what people are thinking or saying.  I have a crew cab standard bed,  spec says 36 gallon,  build sheet says 36,  ive never been able to get more than 29 gallons in. 

What 'remaining range' is your truck saying when the low fuel light comes on? 

nards444 Senior Enthusiast

nards444

Posted
Posted
13 minutes ago, redwngr said:

What 'remaining range' is your truck saying when the low fuel light comes on? 

You know I dont know but I have ran it down to under 40 miles

Another JR Senior Enthusiast

Another JR

Posted
Posted
10 hours ago, nards444 said:

 

Maybe but thats not what people are thinking or saying.  I have a crew cab standard bed,  spec says 36 gallon,  build sheet says 36,  ive never been able to get more than 29 gallons in. 

Have you discussed it with your dealer service dept?  It could be normal, or it could be wrong tank, wrong sending unit, or wrong display software configuration. The dealer should be able to check all those things to diagnose it if they agree it’s not normal behavior. I would think it would be covered under the warranty. 

  • 4 years later...
rlwatson New Member

rlwatson

Posted
Posted
On 2/7/2020 at 9:22 AM, Zac Davidson said:

I guess I’m not sold that I have the 36 gallon diesel tank just a hunch

List above states diesel double cab standard box is 29 gal.

Crazy Canuck Enthusiast

Crazy Canuck

Posted
Posted
On 3/10/2026 at 10:37 AM, rlwatson said:

List above states diesel double cab standard box is 29 gal.

I feel if he hasn't figured it out in the 6 years since he posted it, he probably never will lol

  • Haha 2

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