Notice

ATTENTION: We are currently averaging a 3 to 4 business day turn-a-round on repairs after we receive your unit.   Please retain your own tracking number when shipping out to us to confirm your units arrival since we DO NOT send out notifications when it arrives here. We send out emails with tracking numbers once your unit has been completed and ships back to you.

Faulty sender units are common to some GM vehicles, but generally speaking will start malfunction at the same fuel level every time due to wear at the sender grid.
Also, you may get a fault trouble code which is usually an indication of a faulty sender or circuit.
A malfunctioning gauge esp. on some GM vehicles will be stuck and not move at all or be off the scale altogether.