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Q:

why isn't the fuel gauge working properly? on 2001 Buick Regal

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
at a long stop light the the fuel gauge will go from full to empty. It happens all the time.
(2) Answers
sounds like the fuel sender, have it check for possible replacement.

Roy
Probably fuel level sensor attached to fuel pump