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If the fuel pump and fuel gauge sensor shares the same housing as is often the case - maybe the person that fitted the pump damaged the sensor or float...
Alternatively it could be a wiring or connector problem, defective gauge or printed circuit.
If the trouble with the gauge started after you worked on it then you likely damaged or created a restriction to the movement of the sending unit. You will have to remove the tank and double-check your work.
Your sending unit in the tank is bad and needs to be replaced. There is a short in it. That is the only thing that can go wrong with it. There is probley a broken wire on it so it wont read right.
This sounds more like a damaged wire shorting out against the frame than a sending unit. My old Volkswagen did the same thing, and with it, the wire from the tank had become corroded with road salt. This may very well be your problem as well, and if so, a simple wire replacement can solve your problem!
The most likely culprit is a faulty Fuel Level Sending Unit (sends fuel level from tank to dash gauge). It may be stuck, or beyond repair and in need of replacement. Dealing with electronics in your tank can be tricky and should be dealt with by a professional.
Your fuel gauge sending unit is bad. Common on this model GM cars. The sending unit is in the gas tank and is part of the fuel pump assembly. Sulphur in the gasoline eats away at the contact points in the sending unit which causes it to fluctuate. Unless you are daring, this is NOT a job for a do-it-yourselfer... You may have to drop the gas tank to get at the fuel pump...Some models have an access plate in the back seat/trunk area that you can lift the fuel pump out of.
Good Luck and BE CAREFUL...... gasoline is dangerous...
you will need new sending unit you have 2 left and right you will need a scan tool and one is not working right most the time is left side sending unit bad not working it can be replaced from inside
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