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Q:

gas gauge on 2004 Chevrolet Impala

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
needle moves all over is no longer acurrate!!
(1) Answer
This is most likely a failure of your fuel sending unit, which will need to be replaced.

For many GM cars, the fuel sending unit and the fuel pump are all one component. I'm not certain that's the case for your Impala. If it is, it can be a costly repair.