Gas Tank

Zac Davidson · February 5, 2020

Hello,

I just got the GMC Sierra AT4 2500HD online it says 36 gallon gas tank, I went to fill up today for the first time because I was getting close to empty and it took 25 gallons. Does anyone know if the 2500s actually have the standard 28 gallon tanks and not 36 like advertised?

sdelam · February 5, 2020

My 2500 CCSB Denali Dmax has a 36 gal.

Ryno12 · February 5, 2020

My CCSB 2500 gas also has a 36 gal tank.

How close to empty were you? Was the gas light on?

Pastusak.t · February 5, 2020

I have a previous gen but it’s still 36 gallons and if I’m bone dry (driving with the light on for 15-20 miles) it’ll still only take 31 gallons. So could be that you just filled up before it was empty. Just a thought.

MTU Alum · February 6, 2020

Some of the shorter wheelbase trucks have smaller tanks. I don't remember off the top of head which model and engine.

#iworkforGM

redwngr · February 6, 2020

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 36.

HD Reg cab gasser = 36, diesel = 28

I'm surprised they have both a 28 and a 29 in the system.

I've put 132 litres in my 2018, (which is also supposed to be a 36 gallon tank).

That's 34.8 usgal.

I don't make a habit of that, but am often at 128 to 130 litres (about 34 usgal)

Estimated range screen changes from a number to a 'range low' message somewhere in the 50 miles remaining range. :driving:

Edited February 6, 2020 by redwngr

Zac Davidson · February 6, 2020

8 hours ago, Ryno12 said:

My CCSB 2500 gas also has a 36 gal tank.

How close to empty were you? Was the gas light on?

Well to be fair it said I had 109 miles left so I guess not to empty...I’ll wait longer next time

Zac Davidson · February 6, 2020

3 hours ago, redwngr said:

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 36.

HD Reg cab gasser = 36, diesel = 28

I'm surprised they have both a 28 and a 29 in the system.

I've put 132 litres in my 2018, (which is also supposed to be a 36 gallon tank).

That's 34.8 usgal.

I don't make a habit of that, but am often at 128 to 130 litres (about 34 usgal)

Estimated range screen changes from a number to a 'range low' message somewhere in the 50 miles remaining range.

Thank you for this

SkidooSteve12 · February 6, 2020

I've put 32.93 gallons of gas in my 2020 and low fuel light on and I think it said Range Low. Pretty nice to be able to run that long on a tank compared to my old 1500.

Ryno12 · February 6, 2020

Well to be fair it said I had 109 miles left so I guess not to empty...I’ll wait longer next time

That’s about right then for a 36 gal tank. I’m currently showing 117 miles left with just under a quarter tank on the gauge.
Quarter tank=9 gallons

Zac Davidson · February 6, 2020

6.6 Gas L8T, All Box/Cab Configurations: 36 Gallons
6.6 Diesel L5P Double Cab Long Box/Crew Cab Standard and Long Box Configurations: 36 Gallons.
6.6 Diesel L5P Double Cab Standard Box Configuration: 29 Gallons.
6.6 Diesel L5P Regular Cab Long Box Configuration: 28 Gallons.

I have a 6.6 Diesel standard box At4 2500HD

what are the differences here;

crew cab?

double cab?

regular cab?

Ryno12 · February 6, 2020

6.6 Gas L8T, All Box/Cab Configurations: 36 Gallons

6.6 Diesel L5P Double Cab Long Box/Crew Cab Standard and Long Box Configurations: 36 Gallons.

6.6 Diesel L5P Double Cab Standard Box Configuration: 29 Gallons.

6.6 Diesel L5P Regular Cab Long Box Configuration: 28 Gallons.

I have a 6.6 Diesel standard box At4 2500HD
what are the differences here;
crew cab?
double cab?
regular cab?

Are you asking what the differences are between the CC, DC, & RC?

Zac Davidson · February 7, 2020

Yes sir

SkidooSteve12 · February 7, 2020

I think he's asking how the gas tanks are designed to fit the different cab/box configurations? I'm assuming the gas tanks are just molded to fit in the most available spaces on those trucks, and still be able to be removable for service.