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gas guage erratic on 2002 Buick Rendezvous

goes from to full to empty never know if its full or empty

Classic fuel sending unit failure. Need to replace the unit, it is of course in the fuel tank. http://www.autozone.com/autozone/accessories/Performance/Gauge-Sender/_/N-269r?filterByKeyWord=fuel+gauge+sending+unit&fromString=search