Once the electronically controlled engine fails, the fuel injector and fuel metering unit will be replaced frequently. Among them, the suction control valve is often due to the valve body being worn and stuck, which often leads to failures such as difficulty in establishing rail pressure, difficulty in starting, intermittent flameout, and speed limit at 1500 rpm.

The suction control valve (fuel inlet metering valve) is one of the most important components in the diesel engine fuel supply system, and it is the most important part of the throat.