F 150 4WD Pickup V8-5.4L CNG VIN M (2001)
Fuel Rail Shut-Off Valve
Fuel Rail Shut-Off Valve
The fuel rail shut-off valve (Figure 84) is a normally closed solenoid actuated valve that opens when (along with all of the tank valves) Pin 80 is
grounded by the PCM. The valve isolates the fuel injectors from fuel line pressure when the engine is off. Nominal resistance of the coil is 11
ohms. The fuel rail shut-off valve is wired in parallel with the four tank valves.
Fuel Rail Valve Circuit Operation
When the key is turned to the ON position, the power relay is turned on. The power relay provides power to the PCM and the control side of the
fuel shut off valve relay. The relay provides voltage to the fuel rail valve. If the ignition switch is not turned to the START position, the PCM will
shut off the fuel rail valve after one second. The PCM will open the valve (along with the four tank valves) to provide fuel while cranking. The
valve will remain open when the engine is running unless the inertia fuel shut-off switch is "tripped."
Fuel Injection Supply Manifold
The fuel injection supply manifold delivers high-pressure fuel from the vehicle fuel supply line to the fuel injectors. The fuel injection supply manifold
consists of the following:
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a tubular fuel rail
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eight fuel injector connectors
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a fuel pressure relief valve
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a fuel shut off valve solenoid
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mounting attachments which locate the fuel injection supply manifold and provide fuel injector retention.
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a fuel inlet connection which has a push-connect fitting
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an injection pressure sensor
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an engine fuel temperature sensor
