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Replaced fuelpump on 2007 grand prix and now fuel gauge reads backwards

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You may have damaged the sending unit in reinstallation.

Posted on Apr 19, 2017


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2007 grand prix replaced fuel pump assy now fuel gauge reads full only

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.

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