Question about 1999 Pontiac Montana

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Fuel Gauge Stuck on Full 98 Pontiac Montana

I just bought a 1998 Pontiac Trans Sport Montana a week ago. It had half a tank of gas when I bought it and the Fuel Gauge appeared to show the correct amount. I filled the Gas Tank for the first time when it got low and the Fuel Guage stayed pegged to Full. Still there after driving so long I should have been almost on E. I tried to disconnect the positive on the battery for a bit and reconnect. No luck. Any thoughts? Electrical? Sending Unit? What's the most painless way to determine the cause? Any assistance would be greatly appreciated. Thank you.

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  • Toby Jul 17, 2009

    Thank you so much! I will check that out

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2 Answers

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  • Master
  • 512 Answers

When gauge is pegged at full, usually means a bad ground. Check wires at fuel tank, wiggle around, maybe one came off. The bad news is it is hard to get to without removing the tank. Sometimes you can reach arm in and get to them. Also check body ground at read of van.

Posted on Jul 17, 2009

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  • Pontiac Master
  • 2,359 Answers

Gas tank sender is a flow system.

There are two parts that can go wrong.

1)float can get stuck on the top of the tank
(not too likely)

When you have time,shake the van side by side and see can the float drop back down.

2)The other end of the float work in conjunction with a potentiometer (a type of resistor) to provide reading to the dashboard.

If it's an open circuit then you will get false reading.

Posted on Jul 17, 2009

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1 Answer

Gas gauge always reads full.


Hello John.
The Montana/Venture vans have a problem with the fuel gauge sending units in the early 2000's.
The only cure is to drop the fuel tank, remove the sending unit and replace it.
The fuel gauge sending unit is available separately from the fuel pump.
Thank you for using FixYa.
KL

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