Which of the following problems is the main source of fuel pump and injection system malfunctions?（）<br>A:Improper lubrication<br>B:Air in the fuel system<br>C:Coated fuel lines<br>D:Excessive vibration

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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