I have a 2001 long bed f250 4x4 with the 5.4. and here recently I have noticed that the fuel gauge shows different levels after parking in the same spot. and from a quarter of a tank about 16 to 17 gallons will by the gauge fill the truck. and I am curious how big the tank could be I have searched the internet and cant find much from a vin decoder I found online it says the truck has a 38 gallon tank? is that correct if so then my fuel gauge is way off. and sounds like I either need to look into a new gauge or a new sending unit but before I would like some input on whether or not I have a 38 gallon tank or not. and if there is a way to find out by either looking at the government emissions label under the hood or if there could be another spot somewhere on the truck.
thank in advance

 

ok I guess I should have used google from what I just read it looks like the long wheel base trucks have a 38 gallon tank. and I know the fuel gauge is not always correct but are they known for being up to almost half a tank off?

 

being 15 years old.


bad ground to sending unit
bad sending unit.
bad dashboard gauge..
even bad wiring between sending unit and gauge.

 

do you know where I could find a wiring diagram online so that I can trace some wires?

 

start at the fuel tank...sending unit.. 3 to 5 wires.. and they go to the dashboard.


power for pump
ground for pump
high for gauge
low for gauge
ground for tank (maybe)


manuals for Ford trucks can be hard to get. sometimes. try a auto parts store.