What component is responsible for providing fuel to the APU?

The component responsible for providing fuel to the Auxiliary Power Unit (APU) is the right wing collector tank. This tank serves as a reservoir that supplies fuel specifically for the APU when it is in operation. The APU often requires a dedicated fuel source that is independent of the main engine fuel supply to ensure that it can function effectively during periods when the main engines are not running, such as during ground operations or when the aircraft is parked.

While options like the main engine fuel line, fuel transfer pump, and cutoff valve are related to the aircraft's fuel system, they serve different purposes. The main engine fuel line transfers fuel from the tanks to the main engines, while the fuel transfer pump is responsible for moving fuel between tanks rather than providing a direct supply to the APU. The cutoff valve is used to control fuel flow and can be utilized for maintenance purposes or emergency shutoff situations but does not serve as a fuel source itself. Hence, the right wing collector tank being specifically linked to the APU's fuel supply solidifies its role in ensuring the APU receives the necessary fuel to operate efficiently.