What is the role of the fuel selector valve?

The fuel selector valve plays a crucial role in aircraft fuel management by allowing the pilot to select which fuel tank will supply fuel to the engines. This functionality is essential for optimizing fuel use and ensuring the aircraft operates efficiently and safely. By enabling the selection of different fuel tanks, the pilot can manage fuel load distribution and maintain balance, particularly when operating with various tank levels.

The ability to choose the source of fuel helps manage weight and balance during flight, especially in instances where one tank might be lower on fuel than another. Efficient use of the fuel selector valve can also help prevent fuel starvation and ensure that the engine receives a consistent flow of fuel.

The other options, while related to fuel systems, do not accurately describe the primary function of the fuel selector valve. The valve does not measure fuel efficiency, monitor engine fuel temperatures, or regulate fuel pressure; these functions are usually managed by separate instruments or systems within the aircraft's overall fuel management system.