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I had this problem with my 2002 Montana. The fuel gauge inside the tank was defective I went to a garage where and had the gauge changed (you can buy the part from the dealer ) You have to take the fuel tank down and unplug the wires and the fuel lines(you need a special tool to disconnect the fuel lines) Parts and labor cost me $260.00

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Q: 2002 Pontiac Montana fuel gauge is either empty or full why?
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