What device connects the collector tank to the wing tank to replenish it?

• A. Gravity-Feed manifold
• B. Electric pump
• C. Manual drain valve
• D. Pneumatic line

Answer: (A)

Gravity-feed transfer is used to replenish wing tanks from the collector tank because it provides a simple, passive path for fuel to move from a higher reservoir to a lower one. When the collector tank sits above the wing tanks, fuel can flow through a gravity-feed manifold without needing pumps or external power, helping keep wing tanks topped up and the system balanced with minimal hardware and potential failure points.

The other options require active means or serve different purposes: an electric pump would move fuel but adds power requirements and complexity; a manual drain valve is intended for draining liquid, not for transferring fuel to replenish tanks; a pneumatic line uses air pressure, which isn’t the typical method for transferring liquid fuel between tanks and can introduce unwanted air into the system.