Which fuel tank can supply fuel to both engines and the APU?

The center tank is designed to supply fuel to both engines and the Auxiliary Power Unit (APU) on the A320. This tank plays a vital role in managing fuel distribution and ensuring that the engines and APU have the necessary fuel supply during various phases of operation.

Both engines receive fuel from the wing tanks primarily, but in addition to this, the center tank can be utilized when required, especially during takeoff or when running the APU. This capability allows for flexible fuel management and optimizes weight distribution throughout the aircraft.

In contrast, the wing tanks mainly service the engines and there's no provision for the APU to draw fuel from them. The forward tank, typically referring to a section in the belly of the aircraft, is not standard on the A320 series and does not serve the same function as the center tank. Thus, the center tank's function is essential for ensuring that both engines and the APU have access to fuel.