With the help of the suction control valve (SCV), the supply pump regulates the fuel volume in a more accurate way, that is, the output volume of fuel is just the amount needed to maintain the rail pressure required.

Professional tools are needed to detect the fuel suction control valve, such as a fuel suction control valve adjusting device. The drive current that drives the suction control valve can be adjusted, but some people can use a simple method to detect the quality of the fuel suction control valve.

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 working principle of the fuel metering unitSo what exactly does the fuel metering unit do? The fuel metering unit is also called the fuel metering proportional valve. It is installed in the fuel inlet position of the high-pressure fuel pump, used to adjust the fuel supply and fuel pressure value.

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.

When your car has stalling issues, bad rough idling, huge RPM fluctuation problems, you have to consider that it may be the suction control valve(SCV) problem! The suction control valve is often overlooked when you are having issues with your vehicle.