Faulty Fuel Sender Unit: This unit, located in the fuel tank, sends the fuel level information to the gauge. If it fails, the gauge may read incorrectly or not at all.
Bad Fuel Gauge: The gauge itself might be malfunctioning or have an electrical issue.
Wiring Issues: Damaged or loose wires between the fuel sender and the gauge can cause problems.
Blown Fuse: A fuse related to the fuel gauge system might be blown.
Grounding Issues: Poor grounding can disrupt the signal and affect gauge readings.