Which component is responsible for regulating engine fuel flow?

Which component is responsible for regulating engine fuel flow?

• A. The Engine Control Unit
• B. The Fuel Metering Unit (FMU)
• C. The Fuel Pump Unit
• D. The Fuel Temperature Sensor

Answer: (B)

Fuel flow regulation is carried out by the Fuel Metering Unit because this is the component that actually meters the amount of fuel delivered to the engine’s injectors in response to the engine’s commanded demand. The Fuel Metering Unit receives control signals from the engine’s control system (the ECU/FADEC) and adjusts the metering valve to set fuel flow according to thrust demand, engine speed, and other operating parameters. This direct metering ensures the correct fuel-air mixture and safe operation across the flight envelope. The Engine Control Unit provides the overall commands but does not by itself regulate the instantaneous fuel quantity; the Fuel Pump Unit merely supplies the pressure to move fuel, and the Fuel Temperature Sensor feeds data for performance calculations rather than controlling flow.

Fuel flow regulation is carried out by the Fuel Metering Unit because this is the component that actually meters the amount of fuel delivered to the engine’s injectors in response to the engine’s commanded demand. The Fuel Metering Unit receives control signals from the engine’s control system (the ECU/FADEC) and adjusts the metering valve to set fuel flow according to thrust demand, engine speed, and other operating parameters. This direct metering ensures the correct fuel-air mixture and safe operation across the flight envelope. The Engine Control Unit provides the overall commands but does not by itself regulate the instantaneous fuel quantity; the Fuel Pump Unit merely supplies the pressure to move fuel, and the Fuel Temperature Sensor feeds data for performance calculations rather than controlling flow.