Grand Cherokee 4WD V6-3.0L DSL Turbo VIN M (2007)
Water In Fuel Sensor: Description and Operation
Operation
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 12 V power
signal is always present in order to illuminate the indicator on the instrument cluster.
