It might not be anything wrong with your fuel sending unit. Keep an eye on your other gauges. I own a 2004 Pontiac Bonneville GXP. All of my gauges have started acting erratically. It started with my Temp. gauge, moved on to my speedometer, and now my oil pressure , fuel level and batty volt gauges are affected too. Its a very common problem with GM vehicles.
YOUR FUEL GAUGE IS BROKE OR THE FUEL LEVEL SENDER UNIT IN GAS TANK FAULTY OR STUCK.BUT IF YOU NEED TO REPLACE FUEL LEVEL SENDER UNIT.YOU CAN REMOVE FUEL PUMP THROUGH THE TRUNK JUST REMOVE SPARE TIRE.CHECK FUSE TO HEATED SEAT.IF FUSE IS GOOD.HAVE THE DEALERSHIP CHECK IT OUT.
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