Notice

NOTICE: Our Labor Day Closure Dates are from Aug 28th - Sept 2nd. We recommend having your units in to us for repairs by the 22nd to help avoid delays in processing your order.

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.