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My experience is with a 2002 Impala so this may not apply, however since I had an identical problem and it is a GM product also, here goes: The fuel level sending unit had corroded, bent, contacts. My unit was inside the gas tank and requires quite a bit of work to remove. A very helpful website for this is www.impalahq.com

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โˆ™ 2006-05-17 13:12:39
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Q: How do you fix a gas gauge that reads full one second and then reads empty the next on a 2000 Buick century?
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