2nd Gen Non-Engine/Transmission ok from full to when the light comes on 350 miles ???

[VHolloway]

this is a stock 99 2500 with 285/75/16 bfg mud tires

35 gal tank

 

[wildmanben]

and what exacty is the question here? 10mpg isnt normal if your asking...

 

[VHolloway]

I guess the only way to see how far off the gauge is is to have some other members with the same tire size and rear gear to give some in put

theses fuel tank sending units are wild

how far can I be able to go on a tank

the 33' tires play a part in this as well if you have the same set up let me know

 

[bmoeller]

I would get some hand calculated mileage checks, before getting worried. If the gauge is accurate at all, they is something wrong. Should be able to to better than that, assuming non-towing mileage. Even then 10mpg still seems a tad low.

 

[jhurst]

If I fill up right when my light comes on, I can only get about 24 gals in. So I still have 10 gals left. (34gal tank)

 

[VHolloway]

my wife drives the truck to work and back I don't drive do to vary poor eye sight. we need to know how much fuel she puts in at a fill up that will lets us know whats going on

we had the fuel sending unit replaced what a pain in the $$$ that was

thanks for all your feedback

 

[Nate]

I usually fill up at 1/4 tank, and I put 22-23 gallons in.

 

[DNewell]

My light comes on with only 1/8 tank left. When i fill up, I shake the truck around quite a bit because the vent problem prevents the tank from becoming completely full when the pump shuts off. Sometime, if you've got the truck, fill it until the pump shuts off, then shake the bed around a bit and keep filling it up. I usually fill it until the fuel sits level with the end of the filler nozzle. Be careful because the fuel foams and can spit back at you a little bit. Fill it up one time to this point, and then run the truck for however long you want to, and then come back and fill it to exactly the same specifications the next time and then calculate the mileage. If you have bigger tires, you will need to calculate the difference in the tire sizes to calculate the mileage difference. You can take the truck to a dealer and have the computer reprogrammed for the bigger tires. At this link, they have a superior tire size calculator:

http://www.1010tires.com/TireSizeCalculator.asp?submit=yes&vehicle=yes

I calculated the difference on your tires as compared to stock, and it only equates to 7. 22% difference. If you were at 10mpg, this would equate to almost 11mpg. Either something's wrong, or I would say that you try the fill to the brim and then refill to the brim method.

 

[VHolloway]

thanks so vary much

this forum has some realy nice people on it

that tire site is real neat thanks