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My 2000 GLS does the same thing. When I fill it it reads full for a few moments then goes to straight to empty. If I am going down the road I can shift into neutral shut the motor off and restart but the gauge does the exact same thing again. I was told it was the sending unit but have not fixed it yet. The guage works fine after some driving and the needle comes off full.

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โˆ™ 2005-09-15 18:22:55
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Q: Why does the gas gauge on a 99 Alero suddenly drop to Empty even though the tank is completely full How do you rectify the situation?
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