Which component is NOT part of the fuel metering unit?

The fuel metering unit is a critical component in engine systems that regulates the flow of fuel to ensure optimal performance and efficiency. The high-pressure pump is not included within the fuel metering unit itself. Instead, it is typically a separate component that works in conjunction with the metering unit to deliver fuel at the necessary pressure.

The fuel metering unit typically includes components such as the fuel valve, which controls the amount of fuel that flows through the system, and the 3D cam, which helps in controlling the fuel flow based on different operating conditions. The Ng governor is also part of the fuel metering system as it manages engine speed and ensures that the fuel flow corresponds appropriately with the engine's power requirements. Therefore, the high-pressure pump, while essential for the overall fuel delivery system, operates separately and is not considered a part of the fuel metering unit itself.