1999 Pontiac Grand Am gas gauge is misreading

1999 PONTIAC GRAND AM
265,000 MILES • 6 CYL • FWD • AUTOMATIC
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RAINZ
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  • 12 POSTS
this is a new one for me. I'm not sure why or how to fix it. The gas gauge reads normaly until about 1/2 tank left, then it runs up towards to full mark again as the tank runs closer to empty. If it wasn't for the trip gauge ( i get about 500km per tank) i wouldn't know how much gas is left i fill up at 450km and usually have 10liters left. Anyone with a fix? THANKS!!
Apr 20, 2009 at 3:46 PM
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MMPRINCE4000
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  • 8,548 POSTS
Either the gauge itself or the sender in tank. Most GM dealers can test gauge, if sender then tank will have to be dropped and fuel pump assy. replaced.
Apr 25, 2009 at 8:29 AM