fuel tank gas gauge is constantly moving from full to empty?

2000 BUICK REGAL

169,800 MILES • V8 • FWD • AUTOMATIC

CHEVYOY33123

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my fuel tank gas gauge is constantly moving from full to empty and i can never tell how much gas i have in the tank. and i want to know what might the problem be?

Apr 20, 2009 at 9:49 PM

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SQM

CAR REPAIR CONTRIBUTOR
6,383 POSTS

Hello,

Sounds like either the fuel sending unit in the fuel pump is defective or the gauge cluster is faulty.
Do you have issue with any other gauges? or just the Fuel level gauge?
If that is the case then it is more likely the fuel sending unit. Which has a float that tells the amount of fuel in the tank.

Here is a helpful article:

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

I have also attached replacement procedure for the sending unit.

Let me know if you have any questions.

Thank you.

Images (Click to enlarge)

Jul 16, 2021 at 10:51 AM