If you replaced the fuel pump then one of two things probably happened. Recheck the electrical connection on the sending unit or your sending unit was damaged when you replaced the fuel pump. The sending unit is the float/arm device (like a toilet) that sends a resistive signal to your fuel gage. Depending on the vehicle, some failed sending units read full when bad and some read empty when bad. Did you bend the arm of the sending unit when you removed the fuel pump? Did the float happen to stick in a particular spot? The easiest thing is to check your connections at the tank. Most vehicles have two electrical connectors. One for the fuel pump and one for the sending unit. If you are satisfied that the connectors are fine then I would recommend dropping the tank again and inspecting your sending unit. It is virtually impossible to connect the sending unit to the fuel pump cable and vs. versa. Some vehicles have only one electrical connector for both. Sorry but that is the best answer than I can give you.
SOURCE: fuel level gauge
some of this vehicles have a computer system, that will allow you to diagnose the fuel gage with an aftermarket sacan tool,
than most of auto repairs have, but i will recomend you to check also the conector by the fuel pump and make sure there is not any corosion or melting circuit inside the conector,
what the scan tool does is triger your gage and that way you will know if you have a bad gage.
SOURCE: Gas Gauge Constantly Reads Full.
You will need to replace the Guage. If it is Inside a Cluster, You will need to Replace the Entire Guage Cluster for this Repair. Please Rate My Response! Thanks!
SOURCE: My 2001 grand prix se the fuel gauge stays in the
faulty sender unit in the tank ,its swollen slightly and its sticking on the shaft ,common problem with a lot of vehicles ,or the float fills with petrol and it shows empty .
if it worked for a short period of time after doing the pump/sending unit the check the connections going to the pump/sending unit they would have been moved around doing the pump
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