Fuel Level Sensor: Description and Operation

The fuel level sensor is a rheostat mounted on the fuel sender assembly. The PCM supplies the sensor with a 5 volt reference and a ground. The sensor varies the 5 volt input voltage based on the level of fuel in the tank. The PCM uses the signal voltage to calculate the amount of fuel in the tank.

The fuel level sensor is part of the fuel sender assembly. The PCM uses the fuel level input to make sure that the level of fuel in the tank is sufficient to run the EVAP tests. The PCM also sends the fuel level information via class 2 to the Instrument Panel Cluster (IPC). The IPC uses the information to control the fuel level gauge.