Water In Fuel Sensor: Description and Operation
DESCRIPTIONWater In Fuel Sensor:
The water in fuel sensor (WIF) is located in the fuel filter housing. The sensor detects the presence of water in the fuel. If water is present in the fuel a signal is sent to the ECM and the ECM signals the instrument cluster, over the CAN bus, to illuminate the water in fuel warning.
OPERATION
The non-dielectric properties of the water allow the sensors probes to close the electronic circuit when water is present in the system. When diesel fuel is present in the system, it's dielectric (does not conduct electricity well) properties do not allow any electrical contact between the probes. A 12V power signal is always present in order to illuminate the indicator on the instrument cluster. For removal and installation procedure refer to (Refer to FUEL SYSTEM/ FUEL DELIVERY/FUEL FILTER - REMOVAL).