GM 6.5L V8 – Electrical Systems – Fuel Shut-Off Solenoid Circuit

The electrical circuit for the fuel shut-off solenoid in the injection pump involves the ignition switch as the only control (refer to Figure 8-27). A fusible link at the junction block provides circuit protection.

When the ignition switch is in the OFF position, the fuel shut-off solenoid circuit is open. The spring tension of the fuel shut-off solenoid and governor linkage operate a lever that moves the metering valve inside the injection pump to the “ no fuel” position (see page 7-32 for more information).

When the ignition switch is in either the CRANK or RUN position, the circuit for the fuel shut-off solenoid is complete. The action of the solenoid lever allows the governor linkage inside the injection pump to control the position of the metering valve.

The fuel shut-off solenoid is designed to operate with a minimum of 8 volts. The resistance of the solenoid coil is 3.5 to 4.5 ohms at room temperature. Diagnosis includes initial testing by listening for the clicking sound of solenoid operation as electrical power is momentarily connected and disconnected.

 

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