Aircraft systems and instrumentsQuestion 645 of 934

Which type of airplane usually has a gravity-feed fuel system?

  1. A low-wing airplane, with the tanks below the carburetor
  2. Any airplane that has a fuel injection system
  3. A high-wing airplane with tanks above the carburetor
  4. An airplane that has a turbocharger installed
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Correct answer: A high-wing airplane with tanks above the carburetor

On low-wing airplanes the tanks are below the carburetor, so fuel pumps are installed.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Fuel Systems — Gravity-Feed System, page 185

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Questions last reviewed: 18 October 2026