Fuel Gauge: Description and Operation

CIRCUIT OPERATION
The Body Control Module (BCM) calculates the pointer position of the fuel gauge based on the input of the fuel tank gauge level sending unit relative to fuel tank ground. The G4 circuit sends the signal to the BCM.

The fuel pump module, located in the fuel tank, contains the fuel pump and the variable resistor for the fuel gauge. Ground for the resistor is located on the left rear quarter panel. As the position of the float arm changes, the resistor changes the current flow through the G4 circuit. The change in current flow is then measured by the BCM and pointer position is adjusted to reflect the fuel tank level. The signal is sent over the CCD Bus to the instrument cluster.