What is the purpose of a fuel selector valve?

The purpose of a fuel selector valve is to choose the fuel tank supplying fuel to the engine. This valve is crucial in aircraft because it enables the pilot to select from different fuel tanks, which can be located in various parts of the aircraft, often in the wings or fuselage. By selecting the appropriate tank, the pilot ensures that the engine receives fuel from a source that is optimal for flight conditions and also allows for balanced fuel management throughout the flight.

Proper utilization of the fuel selector valve helps maintain the correct operating weight and balance of the aircraft, especially in multi-tank systems where fuel levels might differ. Additionally, in the case of fuel contamination or other issues, the pilot can switch tanks to ensure a continuous and safe fuel supply to the engine, enhancing flight safety and performance. This function is critical for ensuring the engine operates smoothly and for managing fuel efficiency during flight.