Water-in-Fuel Indicator Data Valid but Above Normal Operational Range – Least Severe Level
|Fault Code: 418
LAMP: Amber (Maintenance flashout)
Water-in-Fuel Indicator Data Valid but Above Normal Operational Range – Least Severe Level. Water has been detected in the fuel filter.
Possible white smoke, loss of power, or hard starting.
Water-in-Fuel Sensor Circuit
The water-in-fuel sensor is attached the fuel filter housing. The ECM monitors the water-in-fuel sensor in order to flag a fault when a set volume of water has accumulated in the fuel filter. The water-in-fuel circuit contains two wires, a ground wire and a signal wire.
In automotive, industrial, and power generation applications, the water-in-fuel sensor is integrated into the bottom of the OEM supplied suction fuel filter. The OEM supplied fuel filter is located on the intake side of the engine. For marine applications, the water-in-fuel sensor is mounted at the base of the water/fuel separator bowl on the fuel filter housing. This fuel/water separator housing contains a serviceable element. The filter housing location will vary with each OEM. Marine applications utilize a dual WIF sensor configuration. This assembly incorporates a y-harness with either two WIF sensors (duplex filtering) or one WIF sensor and a terminating resistor.
In automotive, industrial, and power generation applications, the water-in-fuel sensor is integrated into the fuel filter. It is automatically replaced whenever the fuel filter is replaced. For marine applications the sensor is not integrated into the fuel filter and is a serviceable item. Possible causes for this fault code include:
- Water in fuel
- Damaged sensor
- Fuel contamination.