SENSOR-WATER IN FUEL
DESCRIPTION
The WIF sensor is located in the bottom of the fuel filter/water separator. The sensor also has a drain channel and a protrusion for adapting a hose during draining .
OPERATION
The sensor sends an input to the Engine Control Module (ECM) when it senses water in the fuel filter/water separator. As the water level in the filter/separator increases, the resistance across the WIF sensor decreases. This decrease in resistance is sent as a signal to the ECM and compared to a high water standard value. Once the value reaches 30 to 40 kilohms, the ECM will activate the water-in-fuel warning lamp. This all takes place when the ignition key is initially put in the ON position.
REMOVAL
1. Disconnect negative battery cable.
2. Disconnect WIF sensor electrical connector .
3. Drain fuel filter/water separator assembly by loosening the WIF at bottom of fuel filter and opening the bleeder screw on top of the filter/separator. (Refer to 14 - FUEL SYSTEM - STANDARD PROCEDURE).
4. Unscrew WIF sensor from fuel filter/water separator assembly.
INSTALLATION
1. Install WIF sensor with new seal into fuel filter hand tight.
2. Connect WIF sensor electrical connector .
3. Prime fuel system using fuel priming diaphragm (Refer to 14 - FUEL SYSTEM - STANDARD PROCEDURE).
4. Connect negative battery cable.