MDE 5 Q5

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Question: What is the purpose of the delivery valve in scroll type fuel injection pumps?

D) To filter contaminants from the fuel before it reaches the injector

B) To control the timing of the fuel injection

C) To prevent backflow of fuel from the high-pressure side to the low-pressure side

A) To regulate the fuel pressure before it enters the pump

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Question: In scroll type fuel injection pumps, how is the delivered quantity of fuel varied?

B) By changing the angle of the delivery valve

A) By adjusting the rotational speed of the pump

D) By altering the temperature of the fuel

C) By modifying the position of the scroll or cam mechanism

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Question: In scroll type fuel injection pumps, how is fuel oil prevented from spraying out if the high-pressure pipe fails in service?

A) By using a pressure relief valve to divert excess fuel

C) By incorporating a shut-off valve in the pump assembly

B) By employing a safety valve that closes off the fuel supply

D) By utilizing a design that allows fuel to bypass the high-pressure pipe

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