The fuel filter assembly has a fuel heater (refer to Figure 8-29). The fuel heater receives power through the GAGES fuse when the ignition switch is in the CRANK or RUN position. The fuel heater circuit is completed through the metal of the fuel filter housing to the engine intake manifold.
When the circuit of the fuel heater senses a temperature below 40° F (5° C) inside the fuel filter assembly, it completes the circuit for a heating element. As the temperature increases above 75° F (24° C), the circuit opens the heating element circuit. The resistance of the fuel heater element is 2 ohms at room temperature, providing a current flow of approximately 6 amperes.
See page 7-21 for details about diagnosing and servicing the fuel heater.
