The injection pump of a diesel engine is driven by:

• A. A camshaft
• B. Piston action
• C. The governor
• D. The gudgeon pin

Answer: (A)

The pump is driven by the camshaft. In a mechanical diesel injection system, the camshaft provides the timing and actuation for the pump through its lobes, so each injection is timed to the engine cycle and occurs once per cylinder per cycle. The camshaft’s rotation controls when the pump plunger or metering element moves, delivering fuel at the correct moment in the compression stroke. The governor inside the pump regulates how much fuel is delivered, not when the pump is driven. The gudgeon pin and piston action are related to the engine’s or pump’s mechanical components, not the drive source for the injection pump.