Fuel Gage

Voltage to the Fuel Gauge is supplied through the PNK (39) wire with the Ignition Switch in START or RUN. The movement of the Fuel Gauge needle is controlled by current flowing through two coils in the Gauge. This movement creates magnetic fields in the coils The amount of current flowing through each coil is controlled by the Fuel Level Sensor W/ Fuel Pump. Voltage from the PNK (39) wire is applied to one end of the EMPTY (E) coil. The other end of the E-coil is connected to the FULL (F) coil, Fuel Level Sensor W/ Fuel Pump and PNK (30) wire.

When the Fuel Tank is empty the resistance of the Fuel Level Sensor W/ Fuel Pump is low (1 ohm). This allows more current to flow through the E-coil and the Fuel Level Sensor W/ Fuel Pump resistor, and the magnetic field in the E-coil pulls the pointer toward E on the Fuel Gauge.

When the Fuel Tank is Full, the resistance of the Fuel Level Sensor W/ Fuel Pump is high (88 ohms). This allows more current to flow through the F-coil to ground, and the magnetic field in the F-coil pulls the pointer toward F on the Fuel Gauge.