Water In Fuel Sensor: Description and Operation

Water-In-Fuel Sensor:

The Water-In-Fuel (WIF) sensor is located at the bottom of the fuel/water separator filter. When water is sensed in the fuel, this sensor sends an input signal to the engine controller and the engine controller in turn illuminates the Water-In-Fuel lamp on the instrument panel.

The engine controller looks at the Water-In-Fuel sensors signal under the following conditions:

- When the key is rotated to the RUN position.
- At the conclusion of the intake air heater post-heat cycle.