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My feul gauge wont go bellow half a tank on my 1989 gmc sierra 2500

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You well have to change the sending unit located in the tank. Some GM trucks you must change the fuel pump unit for it is all made together

Posted on Apr 04, 2011

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Posted on Jan 02, 2017

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1 Answer

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I don't think you could trust that either. Sounds like the sending unit in the tank is messed up, so it may never read correctly. By now, you must know the approximate miles per gallon it gets, so until you get the gauge fixed, you should go by the number of miles you go to know when it needs gassing up. Just as a ballpark figure, a '97 Sierra, city driving, maybe 15-17 mpg? I really don't know, you could google it I'm sure.

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