2003 Avalanch fuel gage

there maybe a problem caused when you replaced the pump. you may have to pull the pump out and make sure the gage float travels its full range and is not getting caught on something when you changed the pump.

USSUALLY WHEN GAGE GOES WAY OVERFULL IT'S A BAD GROUND
QUICK CHECK USE BOOSTER CABLE ONE END ON TANK OTHER END ON BATTERY NEGATIVE IF GAGE GOES OK MAKE UP SHORT WIRE FROM FRAME TO TANK SEEM LIP
AND ATTACH MAKE SURE METAL IS CLEAN

I have been having this same problem since about 6 months into owning the car... I have had it back to the dealership around 5 times including having the fuel guage replaced which fixed the problem for only a few months until it went back to this half full situation... I believe the tank is actually full and wonder what would happen if I just ran it past the empty warning... would the car stop? I just had it back at the dealer and they said they reset the equipment and on the way home I filled the tank and guess what? yes half full! so it is booked in again for next week... I agree it is annoying not to mention the having to fill the tank twice as often... would love to know if you had a resolution...

1st think see if fuel filter is plugged, also is there a check eng. lite

I hope you did not top it off because filing it up like that will wreck havoc on the evap system. The engine light should go away as the gas in your tank is used up, or it may take some time, but hopefully it goes away. Just next time you fill up don't top off when it clicks off thats it. Also make sure the gas cap is tight. A loose gas cap can make the check engine light come on. I am an emmission repair specialist, and deals with these crazy things sometimes lol.

try changing the fuel sender ....

I took the vehicle to the Jeep dealership, and the problem went away before they could check it out. They are going to check wiriing next, because the check engine light went out on its own, and the fuel gage began working corectly on its own. Not sure what caused it, but hope to have an answer from the dealer.

the gas gauge is on the fuel pump assembly with in the fuel tank, you must have bumped it during reassembly. the only solution is removal. pull it out check for alignment and binding, reassemble being very careful. hope this helps.

have the computer checked out. may need reprogramming and have updates added. also check for loose or corroded connections at the terminals.

it is the pontimeter in the fuel sender you can buy it seperate from the whole assembly and they had alot of problems with them please rate -jeff