What mechanism provides replenishment of the collector tank from the wing tank?

• A. Gravity-Feed manifold connected to the wing tank by a scavenge ejector
• B. Electric pump from the wing tank
• C. Manual valve from the cockpit
• D. Pneumatic transfer line from the wing tank

Answer: (A)

Replenishing the collector tank from the wing tank is done with a gravity-driven feed that is aided by a scavenge ejector. Fuel from the wing tank feeds into a gravity-feed manifold, and the scavenge ejector uses a high-velocity flow (often air or fuel through a Venturi-like throat) to create suction that entrains fuel from the wing tank into the manifold and into the collector. The gravity head keeps the fuel positioned to flow, while the ejector actively moves it, ensuring a steady transfer without needing electric pumps. This setup provides automatic replenishment across different flight conditions and pressures, and avoids the need for an electric pump, a manual cockpit action, or a separate pneumatic transfer system.