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單項選擇題

Which of the following problems is the main source of fuel pump and injection system malfunctions?（）

A.Improper lubrication
B.Air in the fuel system
C.Coated fuel lines
D.Excessive vibration

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單項選擇題

Which of the following faults would allow lube oil to enter the cooling system of a diesel engine?（）

A.Excessive valve train lubrication
B.Leaking standby oil cooler core
C.Excessive lube oil pressure
D.Excessive lube oil in the system

單項選擇題

Problems with the diesel engine fuel injection pump are usually caused by（）

A.improper adjustment
B.contaminated fuel
C.kinked fuel lines
D.excessive engine vibration

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