Question about 2003 Chevrolet Cavalier

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Replaced fuel pump now gas gauge is screwy

I'm wondering what I might have done wrong to make the gauge start acting up. I'm no mechanic but I can twist a wrench. A girl has to do what a girl has to do. I get the feeling I'm gonna have to drop the tank again...sigh.

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The sending unit sends a signal to the engine control module. The engine control module sends a serial message to the fuel gauge.
Check the connection at the fuel tank. If you have a digital multi-meter, check the resistance on the "purple" wire at the fuel tank connector, fuel tank side. The amount of resistance will be determined by the amount of fuel in the fuel tank. Generally it should be between 10 and 255 ohms.
Below is the wiring diagram for your car. Hope it helps, let me know.
Regards.

Posted on Mar 03, 2009

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You may have trapped the wire round the flout in the tank. can happen when putting back togeather

Posted on Sep 29, 2013

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  • Master
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Did you replace the wiring harness? Every vendor list this warning under the fule pump number. The sending unit that controls the gauge is part of the fuel pump assembly.

DUE TO ELECTRICAL REQUIREMENTS, WIRING HARNESS REPLACEMENT
IS STRONGLY RECOMMENDED

This is the harness that plugs into the fuel pump.

Posted on Mar 03, 2009

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