Definition
A device on a piston engine that mixes fuel with incoming air in the correct proportion before that mixture enters the engine's cylinders for combustion. The carburetor meters fuel based on airflow drawn through a narrowed passage (a venturi), which creates a pressure drop that pulls fuel from a small reservoir into the airstream.
Plain English
The part of the engine that blends fuel and air together so the engine has something to burn. Air flows through it, and as it does, the carburetor adds the right amount of fuel into the airflow on its way to the cylinders.
Context Anchor
Pilots encounter this term in engine operation, starting procedures, mixture control, carburetor heat use, and engine run-up checks.
Derivation
From the French carburateur, based on carbure meaning 'a compound containing carbon.' The name reflects the device's job of charging air with a carbon-based fuel (gasoline) before combustion.
Why Pilots Care
Correct carburetor function ensures reliable engine power; problems such as icing or improper mixture can lead to rough running or power loss.
Analogy
A carburetor is a little like a kitchen faucet that blends hot and cold water, except it blends fuel and air in the amount the engine needs.
Intuition Check
A carburetor is not a fuel tank or just a fuel line. It is the part that mixes fuel with air before the mixture goes into the engine.
Example Sentence 1
Before takeoff, the pilot applied carburetor heat briefly to confirm it was working and then returned the control to cold for full power.
Example Sentence 2
During the preflight, the student drained a sample from the carburetor drain valve to check for water or sediment.