HOW IT WORKS ENGINE STOPPING

A diesel engine is normally stopped by cutting off the fuel at, or in, the fuel injection pump – not before it.

- Callum Smedley

This is achieved in two ways: either by movement of the fuel control rack to its cut-off position, for single and inline helix pumps; or by shutting off the supply of fuel, inside the pump, often by the use of a solenoid valve, which can be found in rotary fuel pumps.

The fuel cut-off can be operated by one of two methods. Mechanically – usually via a cable and pull handle. Or electrically – using a solenoid operated by either the ignition key or a stop button. The lever, which is moved by either of the above methods, moves the fuel rack to zero on single and inline fuel pumps or it shuts the fuel supply off inside a rotary fuel pump. The injectors are starved of fuel and the engine stops.