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Q3. With reference to a main engine fuel system of the high-pressure common rail type:

(a) Sketch a common rail fuel injection system from booster pump inlet to cylinder head fuel valves, labelling the MAIN components.

(b) Explain how the fuel pumps are operated and the common rail pressure is maintained;

(c) Explain how fuel injection timing and quantity is regulated for the common rail fuel system sketched in part (a).