What is the fault when checking the fuel metering system?
1 Answers
Checking the fuel metering system reveals open circuit or short circuit faults in the metering unit. Metering Unit: When the control coil of the metering unit is not energized, the valve port remains open, similar to an open solenoid valve, allowing maximum fuel flow to the fuel pump. The ECU adjusts the fuel intake volume by altering the cross-sectional area of the high-pressure fuel pump's intake via signals. Fuel Metering Unit: The fuel metering unit is a precision component. Improper maintenance or the use of low-quality fuel filters can lead to excessive moisture or impurities in the fuel, causing wear or sticking of the metering valve spool. This results in metering unit failure, which can trigger engine issues such as unstable idling, lack of power, or black smoke emissions.