The fuel injection pumps are equipped with electrical shut off valves. These solenoid-operated valves block the supply of fuel to the high pressure pumping and distribution components.
The Robert Bosch VE shut off valve is located at the top, rear of the pump.
The Lucas CAV DPA/DPS shut off valve is located at the bottom rear of the pump.
Both 12 and 24 volt activate-to-run and activate-to-stop solenoids are available.
The Stanadyne DB4 shut down solenoid is located under the governor cover.
Both 12 volt and 24 volt energize-to-run and energize-to-stop solenoids are available.
Test the shutdown solenoid on the Stanadyne DB4 fuel injection pump by applyng an electrical current to the
terminals and listening for an audible “ click”. If a solid “ click” is heard, the solenoid is operating freely.
Caution: Do not check energize-to-run solenoid operation with governor cover removed from the fuel injection
pump.
Use the following values to check energize-to-run solenoids with an ohmmeter:
When the valve on the Lucas CAV DPA/DPS pump opens, a “ click” can be heard.
Use the following values to check the solenoid with an ohmmeter.
The Robert Bosch valve does not make a very audible sound when actuated, but it can be checked with an
ohmmeter for the following values:
Caution: Do not connect the electrical wire to the so lenoid when the plunger has been removed. Without the
plunger, the valve can be damaged.
Malfunctioning valves and electrical wiring to the valve can be diagnosed by removing the plunger and spring,
then reinstall the solenoid.
If the engine will start without the valve, the valve or the wiring to the valve is malfunctioning.
This method of removing the plunger to start the engine can be used if necessary to move the equipment to a
service location.
