CouJoe76

ok, on my 88 2wd 302 ive driven 50 miles and im on 1/2 a tank from full. is it a small top or and i gettin 5 MPG? its the rear tank cause i got rid of the side tank

dewman

The rear tank should be about 18 gallons. I have 2 tanks on my 96 F150 and I think the front is almost 20 gallons and the rear is about 18 gallons. Someone will correct me if I am wrong. If you have the owner's manual, it should list the fuel tank capacity for your truck.

wde3477

Could be a gauge / sending unit problem. Just have to fill-up and verify your mileage.

Chiltons lists the rear tank as 18.2, front as 16.5 for short bed; 19.0 rear and 18.2 front for long bed for the 88-91 model years.

CountryBoywith89

Gas Leak? you may find that it isnt even your tank leaking. i cant use my front tank due to if the truck is running , it's pulling gas throught the lines, and the lines are junk, so they leak. maybe this is your problem as well?
-Way

mitchalvin

Check your other tank. Some of these will cross flow the return fuel into the other tank sometimes overfilling it and leaking. It also could be a bad sending unit. On my 83 f250 my front tank reads empty and my rear reads full regardless of the amount of fuel in them I would fix this but there are no longer any sending units available for it.

buck8200

Dude don't sweat it, it is probably just your fuel gauge going out. I lost my fuel gauge accuracy on my 1992 F-150 about 5 years ago. Use your trip odometer to figure out when it is time to fuel up. I never bothered fixing mine....what for? On my 1992, I can put 18 gallons in the front tank and 16 gallons in the rear.