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Fuel gauge always shows full - 2001 Buick Regal

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This is typically a problem with the fuel level sensor that is integral to the fuel pump, in the tank. the only way to repair this issue is to remove the fuel tank and replace the pump. this is a common issue on GM's. the level sensor is a potentiometer, and with wear and tear the "wiper" electrical contact just wears out. you can also try having the vehicle scanned for codes, to eliminate the possibility of another electrical / computer problem (unlikely). good luck!

Posted on Aug 30, 2010

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1 Answer

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You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!

Saabreur

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