Which item on the engine accessory box is used to filter fuel?

• A. HMU
• B. PMA
• C. Generator
• D. Fuel filter

Answer: (D)

The item that filters fuel is the fuel filter. In the engine’s accessory box, the fuel filter’s job is to remove particulates and water from the fuel before it reaches sensitive components like the fuel metering unit and injectors. Clean fuel helps ensure accurate metering, smooth engine operation, and reduces the risk of clogging or damage in the fuel system. The other items serve different roles: the hydro-mechanical fuel metering unit controls fuel flow based on engine demands, the permanent magnet alternator provides electrical power, and the generator also supplies electrical power.