2000 Pontiac Montana

Computer problem
2000 Pontiac Montana Front Wheel Drive Automatic 183000 miles

We purchased our van with 3/4 of a tank of gas when we got into the van 3 days later which during the down time it was not driven the gas gauge said the tank was empty so we took the van to the gas station which a 1/4 mile down the road in which the gas gauge went from empty to full then down to 3/4 of a tank then down to empty again. What could be wrong with the gauge
Cats pad
May 9, 2008.

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