I have a 1997 Chevy S-10 and the gas gauge hasn't worked since I bought it 3 years ago. A few days ago, the gas gauge showed full all of a sudden, but it wouldn't start. It cranks fine, but while the gas gauge shows that there is gas, the S-10 won't start. After turning the key off then back on a number of times, the gas gauge jumps to the full mark, goes back to empty and the S-10 will start. It starts fine when the gauge shows empty, but if there is any time the gauge shows there is gas, it won't start. If I turn the key on multiple times, eventually the gauge will go to zero and the S-10 starts.
Interesting! Well, a gas gauge that always reads empty is a bad ground (-) condition. A gas gauge that always reads full or past full is a bad hot (+) wire. Check and repair the wiring at the fuel pump assembly on the gas tank. I'm thinking that when you have a full tank reading the hot wire is not connected causing the fuel pump not to run and the gauge to swing to full at the same time. The sending unit for the gas gauge is part of the fuel pump module in the gas tank. HTH. -Jim
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