Q1.Describe how a jerk type of fuel pump is replaced, making specific reference to initial setting and governor connections. Explain how the actual and effective strokes are adjusted. Identify the common faults of these pumps. State how engine performance is affected by each of these faults and why prompt attention is necessary.
Q1. A. Describe how a main engine fuel pump would be set and checked for:
(i) Timing; (ii) Quantity
B. Explain how a setting of a variable injection timing fuel pump is checked and adjusted.
C. State why it be necessary to adjust the settings of a variable injection timed fuel pump.
Q4. With reference to auxiliary engine fuel pumps
a) Explain how a fuel pump may be checked for accuracy of injection timing. (6)
b) Describe how fuel pump may be adjusted after overhaul. (5)
c) Explain the circumstances in which it is considered necessary to replace a fuel pump. (5)
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