Find the ground on the sending unit and take a test light and re-ground. that should be the only problem with that, in all my years working on GM's it's always the ground. Let me know how you make out.
check sending unit in tank and check gauge for proper operation and connections, and grounds
7 for the instrument cluster 9 and 10 for highbeam headlamps.
drop the gas tank and change the sending unit
I have an 05 impala and had problems with the speedometer and fuel gauge. The only way to fix it was to replace the whole instrument cluster. Pretty easy to do, only took about 45 minutes.
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How to fix a gas hand on a 2001 Pontiac Bonneville
Push to the gas station.
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sounds like the fuel sensor inthe fuel tank which means removing tank to replace
Replace fuel level sensor in side fuel tank well known problems for these.
Then fix it
Have you checked the gas floater in the gas tank?