2000 Buick Century gas gauge seems to read correct when car is turned on, but quickly reads full, even when it is almost empty.
You're either looking at a short in the wire that goes to the fuel sender, or a bad fuel sender. If it was just a broken wire, it would read empty instead. The fuel sender is a permanent part of the fuel pump, so that has to be replaced as a unit.
General Motors had alot of problems with fuel gauge sending unit cards in the fuel tank.You will have to most likly have to drop fuel tank and check and replace your sensor card assembly.
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