Which system component sends fuel from the center tank to the engines or APU?

• A. Main ejectors or boost pumps send it to the engines/APU.
• B. Transfer ejectors send it to the main tanks.
• C. Scavenge ejectors send it to the collector tanks.
• D. Gravity cross flow can supply the engines/APU.

Answer: (A)

In this question, the key idea is how fuel is moved from the center tank to the engines and the APU. To deliver fuel from the center tank into the engine feed lines, you need a device that creates the pressure (or suction) to push the fuel through the system. That role is filled by the main ejectors or boost pumps. They draw fuel from the center tank and push it toward the engines and APU, ensuring a dependable supply during all phases of flight, including start and high-demand operations.

Transfer ejectors move fuel between tanks, not to the engines/APU, so they don’t serve the engine feed function. Scavenge ejectors pull residual fuel from wings into collector tanks for storage, not for delivering fuel to the engines. Gravity cross flow can allow some fuel movement based on height differences, but it isn’t a reliable, dedicated means to feed the engines/APU without a pump or ejector providing pressure.

So the component that actually sends fuel from the center tank to the engines or APU is the main ejectors or boost pumps.