There are two types of fuel metering valves: normally open and normally closed. Pay special attention to them during maintenance. Due to the failure of the fuel system oil circuit itself, such as fuel quality, fuel pump wear and other reasons, the fuel metering valve wear or jam failure indirectly caused, when replacing the new fuel metering valve, the entire fuel system oil circuit must be checked at the same time , Clean and replace fuel that meets standards.
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.