Fuel Level Sensor: Description and Operation

The fuel level sensor is attached to the modular fuel sender assembly. The resistance of the fuel sensor changes with fuel level by means of a rheostat. Its range is from 90 ohms with a full tank to 0 ohms with an empty tank. This resistance value is sent to the Instrument Panel Cluster (IPC) and displayed on the fuel gauge. It is also sent to the PCM over UART serial data, and used for evaporative emissions system diagnosis.