Which of the following systems helps manage the fuel delivery in an aircraft?

The fuel control unit is essential for managing the fuel delivery in an aircraft's engine. It regulates the flow of fuel to the engine based on the engine's demands, ensuring optimal performance during various phases of flight, such as takeoff, cruising, and landing. This component adjusts the fuel mixture and pressure according to the required power setting, providing the necessary coordination between fuel flow and air intake.

The magneto system, while vital for generating spark to ignite the fuel-air mixture in piston engines, does not play a direct role in fuel delivery management. Similarly, the oil temperature gauge monitors the temperature of the engine oil but does not influence fuel delivery systems. The static source, which is part of the aircraft’s pitot-static system, is used for measuring altitude and airspeed rather than managing fuel delivery. Thus, the fuel control unit is correctly identified as the system that specifically manages how fuel is delivered to the engine.