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Gas gauge 5 gallons off

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64Gasser

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I have a. ‘22 2500 with a 6.4 and a 31 gal gas tank. I have found that my gas gauge is what appears to be 5 gallons off, showing empty when there seems to be an extra 5 gallons in the tank. I’ve seen a few others have ram into this as well and have heard that this is normal for a new gas truck and I’ve heard the opposite. I, however have not seen wjere there was a resolution to this issue anywhere. I’ve spoken with the local dealership and they said basically live with it. I spoke with another that said this didn’t sound right and to bring it in for them to take a look at.

Has anyone else on here ram into the same thing and found a fox for it? I would really rather have an accurate fuel gauge than one that err’s on the side of not showing the additional 5 gallons?

Thanks for any help!
 
Not quite 40 years but its been a standard thing for manufactures to do since 2000.
 
I've heard this is a thing on the new trucks but don't have mine yet to know for sure. I can tell you that on my 2014 1500, the gauge is dead reliable. It has a 26 gallon tank and the low fuel light comes on with about 2-2.5 gallons left. I don't make a habit of running that low as I've always heard it is hard on the pumps. Don't even have the new truck yet and I can tell I'm going to be annoyed by the 31 gallon fuel tank.
 
At 50 miles to empty per the dash, the low fuel light comes on.
At 10 miles to empty per the dash, the miles go away and a low light comes on instead.
I still drove it 10 more miles to the station.
Put 28 gallons in.
Tank is a 32 gal tank.

Another member ran his till it died and I think he only got like 30 gals in the tank.
You will never run it completely empty unless you get a fuel mat to put in the tank that is made for the tank. Even then, I'm not sure you could use all of the fuel.
 
Oh, ok, it’s just kinda annoying knowing that there’s more there, I wouldn’t normally come close to running it that close to empty on a normal tank but pulling a camper, you can almost watch the needle going down while driving. I get it to a point but it’s not a diesel which I can totally understand making sure not to run out of fuel, kinda wish I had known that this was the case before I purchased it, that’s pretty much my biggest gripe about the truck, other than the fuel mileage, but mileage wasn’t why I bought it anyway.
 
Beside what others have said here it is also to maintain fuel in the tank to cool the fuel pump. The pump lasts longer with a good supply of fuel in the tank.
 
Its a bit annoying at first, but you will get used to it and be able to judge how much further you can go. I regularly put 30-31 gallons in it. Well, I did before these prices went crazy, and the pump would stop at $100 or $125. Now, I just fill till it stops around 3/4 unless I am going distance.
 
This is normal. There are several reasons they do this:
1) In tank fuel pumps need to be submerged in order to keep cooled. If they are allowed to run dry or nearly so often, they will fail prematurely.
2) Diesels don't like air getting into the lines. Older trucks certainly were a PITA to re-prime the fuel system. I'd rather not need to worry about it.
3) It also acts as an "emergency reserve".
 
Crusty old shellback said:
At 50 miles to empty per the dash, the low fuel light comes on.
At 10 miles to empty per the dash, the miles go away and a low light comes on instead.
I still drove it 10 more miles to the station.
Put 28 gallons in.
Tank is a 32 gal tank.

Another member ran his till it died and I think he only got like 30 gals in the tank.
You will never run it completely empty unless you get a fuel mat to put in the tank that is made for the tank. Even then, I'm not sure you could use all of the fuel.
Click to expand...
I think I mentioned this before, it's a 31 gal tank... :cool:
 
Crusty old shellback said:
At 50 miles to empty per the dash, the low fuel light comes on.
At 10 miles to empty per the dash, the miles go away and a low light comes on instead.
I still drove it 10 more miles to the station.
Put 28 gallons in.
Tank is a 32 gal tank.

Another member ran his till it died and I think he only got like 30 gals in the tank.
You will never run it completely empty unless you get a fuel mat to put in the tank that is made for the tank. Even then, I'm not sure you could use all of the fuel.
Click to expand...
My 50 gal tank behaves pretty similarly.
Light on at 50 miles to empty (based on EVIC numbers)
But depending on whether I've kept driving or parked then restarted, the Low indicator has come on anywhere between 10 and 25 miles to empty. I have only done this 3 times as I typically not to ever let it get that low.
 
For me, when the gauge get close to empty, I filler up. And with todays prices I'm happy theres still some in the tank. Call me Simple Simon.
 
The BCM is set to show E/low fuel at 8% fuel remaining in the tank.

Yes, in-tank lift pumps need fuel to be cool. I rag on my wife all the time driving her Suby around on E for days on end (her commute is 3 miles).
 
This is one of my frustrations with the new truck too. The range is significantly less than my 04 with the 5.9 with lower fuel economy and a smaller tank.

But the towing experience of the 22... Wow!
 
the system needs about 1 to 1.5 gal to maintain fuel pressure. that amount will never be used.

knowing the limit is helpful when it is really needed.

some vehicles are ok with topping off all the way up the neck, other dont like it (i have typically found it takes 2-3 gal more in the neck, my outback and allroad do this, and on long road trips its helpful. on a 2020 outback i rented by topping off the neck i was able to get 600 miles per tank.

not sure how these trucks do, or if there are diff between the gas and diesel cousins
 
QuattroCS said:
the system needs about 1 to 1.5 gal to maintain fuel pressure. that amount will never be used.

knowing the limit is helpful when it is really needed.

some vehicles are ok with topping off all the way up the neck, other dont like it (i have typically found it takes 2-3 gal more in the neck, my outback and allroad do this, and on long road trips its helpful. on a 2020 outback i rented by topping off the neck i was able to get 600 miles per tank.

not sure how these trucks do, or if there are diff between the gas and diesel cousins
Click to expand...

Diesel = fill to click, wait 30-60 seconds and fill to click again. Or fill till it runs out, truck don't care.

Not to be confused with the DEF tank, don't overfill that sucker, could throw codes.
 
Brutal_HO said:
Diesel = fill to click, wait 30-60 seconds and fill to click again. Or fill till it runs out, truck don't care.

Not to be confused with the DEF tank, don't overfill that sucker, could throw codes.
Click to expand...
thank you @Brutal_HO , Yes i was talking purely fuel tank. Play nice with DEF if you have it ;-).
on the diesel side i do like the lift and self prime as an option/process, not that i am planning on using it. happy its available if ever needed.
 
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