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Aircraft systems and instrumentsQuestion 606 of 934

Why is the danger of fuel vaporization icing practically eliminated in a pressure-type carburetor?

  1. Fuel vaporizes past the throttle valve, where engine heat offsets it
  2. Fuel vaporizes ahead of the venturi, where the air is already warm
  3. The carburetor body is heated by hot exhaust gases around the throttle
  4. The air passes through a filter before it reaches the venturi throat
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Correct answer: Fuel vaporizes past the throttle valve, where engine heat offsets it

Fuel vaporization takes place after the air has passed the throttle valve, where heat from the engine offsets the temperature drop.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Induction Systems — Carburetor Icing, page 169

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Questions last reviewed: 18 October 2026