Which ejectors move fuel from the center tank to the collector tanks?

• A. Scavenge ejectors
• B. Transfer ejectors
• C. Main ejectors
• D. Boost pumps

Answer: (A)

Ejector systems in a aircraft fuel network move fuel between tanks without relying solely on conventional pumps. Scavenge ejectors are the ones that pull fuel from the center tank and push it into the collector tanks. They work on the Venturi principle: a fast jet of fuel creates suction that entrains and transfers the remaining fuel from the center tank into the collectors, helping empty the center tank and keep the collectors stocked for engine feed.

Boost pumps push fuel from tanks to the engine pumps, so they aren’t used to transfer between tanks. Transfer ejectors handle other transfer paths between tanks in different configurations, but the specific move from center to collector tanks is the job of the scavenge ejectors.