In high-wing carburetted engine installations, gravity feed can supply fuel to the carburetor.

• A. False
• B. Sometimes
• C. True
• D. Never

Answer: (C)

Gravity feed works whenever the fuel source is above the carburetor, and in high-wing airplanes the wing tanks sit above the engine. That vertical arrangement creates a hydrostatic pressure head that can push fuel through the lines to the carburetor, even if the engine-driven pump isn’t delivering fuel. This makes gravity feed a viable way to supply fuel during priming or if the pump fails, provided the tanks aren’t empty and the lines and vents are clear. In normal operation, the engine-driven pump still ensures reliable fuel pressure at all times, especially at higher power, but the ability for gravity to supply the carburetor is indeed possible in high-wing carburetted installations.