The fuel filter assembly (figure 4-4) mounts on the rear of
the intake manifold. Two bolts hold the assembly in place.
The filter housing has two primary fittings:
โข an inlet fitting connecting to the pipe/hose from the lift pump
โข an outlet fitting connecting to the fuel injection pump with a hose
A third fitting connects through a hose to a drain valve mounted on the water crossover/thermostat.
The filter assembly is a two-stage replaceable element with integral seals. A threaded nut retains the element in the housing. The element has an air vent valve on its top surface that is used during a filter element replacement procedure. Filter and housing are keyed to fit one way only.
The fuel filter assembly has a fuel heater mounted to its bottom end that is retained with a threaded nut and seal ring. Another part of the fuel filter assembly is a Water In Fuel (WIF) sensor. The WIF sensor has an o-ring seal and two mounting screws. Three wires connect the WIF senยญ sor to a power supply circuit, as well as to an instrument cluster-mounted amber warning lamp.
