Fuel Filter: Description and Operation

Fuel Filter/Fuel Heater/Water Separator:

OPERATION
This vehicle utilizes a combination fuel filter/heater/water separator assembly. The assembly traps contaminants to ensure clean fuel is delivered to the injection pump, separate water from the fuel, and warms the fuel to prevent fuel line clogging due to wax formation.

COMPONENTS
Fuel Filter/Restriction Sensor
The fuel filter is of the spin on type. A sensor in the filter section activates an indicator when fuel flow through the filter is restricted and that the system requires service.

Fuel Heater
The fuel heater section warms the fuel to prevent wax formation and fuel system clogging when the temperature is below -1.8°C (30°F).

Water Separator
The water separator operates on the principal that water is heavier than fuel, and will settle at the bottom of the assembly. There is a water-in-fuel probe located in the water separator section of the assembly. The probe activates a water-in-fuel indicator when approximately 0.1 quart (0.1 liter) of water has accumulated in the bowl. The engine should not be operated while the water-in-fuel indicator is on. The water separator should be drained every 8046 km (5000 miles) or when lamp illuminates.