Fuel Gauge: Description and Operation

Battery voltage is supplied to the gauges from the METER fuse in the passenger compartment fuse box when the ignition switch is in ON or START.

The fuel gauge pointer is controlled by magnetic coils inside the instrument cluster. The circuit is grounded through the fuel gauge sender inside the fuel tank unit. The sender acts as a variable resistor. When fuel in the tank is full, resistance is low, and the pointer indicates full. When the tank is low, resistance is high, and the pointer indicates empty.