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Cummins 4BT – Shut Down Solenoid (In-Line Type Injection Pump) – Troubleshooting

Engines using the Bosch P7100 fuel injection pump with the RQVK governor are equipped with the synchro-start
fuel shut off solenoid to actuate the shut off lever. Both 12 volt and 24 volt external fuel shut off solenoids are available.
NOTE: Refer to Procedure (5-31), Fuel Shut Off Solenoid Adjustment/Replacement – Bosch P7100, for instructions to
replace and adjust the synch ro-start solenoid.

The synchro-start has a weatherpack connector with 3 wires in it.

Wiring Guidelines:
Refer to the chart below to find the correct gauge size and length of continuous wire for the white (pull-in) wire, which
connects to the solenoid wiring.

NOTE: 14 gauge wire is required for the red (hold-in) wire, which connects to the “ Run” terminal on the ignition switch.
NOTE: The black (ground) wire must be the same size as the white (pull-in) wire.