What controls fuel flow into the injection pump on this Ford diesel?

The Fuel Shut-Off Solenoid. With the Ignition Switch in Start or Run it is energized and fuel flows into the Injection Pump; when the switch is turned Off, the solenoid de-energizes, fuel flow stops, and the engine stops running.

At what temperature does the Engine Temperature Switch open?

The Engine Temperature Switch opens when engine temperature reaches 62°C (112°F), de-energizing the Cold Advance and Cold Idle Solenoids and returning timing and idle to normal.

Which fuse links power the fuel line heater and fuel shut-off solenoid?

With the Ignition Switch in Start or Run, voltage is supplied to the Fuel Line Heater, Fuel Shut-Off Solenoid, and Engine Temperature Switch through Fuse Links U and V.

What does the Fuel Line Heater do?

It is wrapped around the fuel line and heats the diesel fuel to melt any wax that might clog the filter. It has an internal thermostat to turn it on as needed.

What components are shown in Figure 1 of this page?

Figure 1, titled 'Glow Plug Controller,' shows the engine with callouts for connector C129, the Cold Idle Solenoid, the Coolant Temperature Sensor, the Glow Plug Controller, and the Glow Plug Harness.

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1988 Ford F-250 Diesel Start/Glow Plug Control System - EVTM Page 33

Diesel start/glow plug control component location and troubleshooting page 32-33

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Service manual component-location table and troubleshooting hints for the diesel glow plug system: cold advance/idle solenoids and engine temp switch in injection pump, controller on RH fender, temp switch opens at 62C.

AI caption February 2008 · Photo 7 of 9

This is page 33 of a Ford EVTM (Electrical and Vacuum Troubleshooting Manual), covering the Start/Glow Plug Control/Run system for a diesel engine. A stamped note at the top directs the reader to TSB 89-12A-34 for a revised illustration and Figure 1 callouts. The text explains diesel starting operation: once the Glow Plug Indicator goes out, the Ignition Switch can be turned to START; with the transmission in park/neutral (automatic) or clutch depressed (manual), the Starter Relay energizes the starter solenoid. In Start or Run, voltage feeds the Fuel Line Heater, Fuel Shut-Off Solenoid, and Engine Temperature Switch through Fuse Links U and V. The Fuel Line Heater melts wax in diesel fuel and has an internal thermostat. The Fuel Shut-Off Solenoid controls fuel flow into the Injection Pump, stopping the engine when the key is turned Off. The Engine Temperature Switch powers the Cold Advance and Cold Idle Solenoids below 62°C (112°F), advancing injection pump timing and raising idle for cold running; above that temperature the switch opens and timing/idle return to normal. Figure 1 shows the engine with callouts for connector C129, Cold Idle Solenoid, Coolant Temperature Sensor, Glow Plug Controller, and Glow Plug Harness. It references the Engine/Emissions Diagnosis Manual, volume H, for more diagnosis.

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Frequently asked questions

What controls fuel flow into the injection pump on this Ford diesel?: The Fuel Shut-Off Solenoid. With the Ignition Switch in Start or Run it is energized and fuel flows into the Injection Pump; when the switch is turned Off, the solenoid de-energizes, fuel flow stops, and the engine stops running.
At what temperature does the Engine Temperature Switch open?: The Engine Temperature Switch opens when engine temperature reaches 62°C (112°F), de-energizing the Cold Advance and Cold Idle Solenoids and returning timing and idle to normal.
Which fuse links power the fuel line heater and fuel shut-off solenoid?: With the Ignition Switch in Start or Run, voltage is supplied to the Fuel Line Heater, Fuel Shut-Off Solenoid, and Engine Temperature Switch through Fuse Links U and V.
What does the Fuel Line Heater do?: It is wrapped around the fuel line and heats the diesel fuel to melt any wax that might clog the filter. It has an internal thermostat to turn it on as needed.
What components are shown in Figure 1 of this page?: Figure 1, titled 'Glow Plug Controller,' shows the engine with callouts for connector C129, the Cold Idle Solenoid, the Coolant Temperature Sensor, the Glow Plug Controller, and the Glow Plug Harness.