Water In Fuel Sensor: 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) .