W 250 Pickup L6-359 5.9L DSL (1989)
Water-In-Fuel Sensor: Service and Repair
Water-In-Fuel Sensor R & R
CAUTION: When removing/installing the fuel/water separator filter, make sure that the fuel heater electrical connector is not turned against the engine.
The electrical connector could get damaged or opened.
REMOVAL
1. Disconnect electrical connector from water-in-fuel sensor.
2. Remove the fuel/water separator filter assembly.
NOTE: The fuel heater should not move when the fuel/water separator filter is removed or installed.
Water-In-Fuel Sensor R & R
3. Remove the square-cut O-ring from the filter connector at the bottom of the fuel heater.
4. Drain the fuel/water separator filter.
5. Remove the water-in-fuel sensor, the O-ring, and the fuel/water drain valve assembly from the separator filter.
INSTALLATION
1. Install new O-ring on the water-in-fuel sensor.
2. Install water-in-fuel sensor into new fuel/water separator filter assembly.
NOTE: If the fuel/water separator assembly is not filled with clean diesel fuel before reinstalling, manual air bleeding of the fuel system may be
required.
3. Fill fuel/water separator assembly with clean fuel.
4. Apply a light film of clean unused engine oil to the fuel/water separator seal.
5. Install a new square-cut O-ring to the filter connector on the bottom of the fuel heater.
6. Install fuel/water separator assembly.
7. Connect water-in-fuel electrical connector to the water-in-fuel sensor.
