In the latter a fine spray of gasoline is drawn from an atomizing nozzle by a current of air induced by the suction of the engine piston, the supply of gasoline being regulated by a float which actuates a needle valve controlling the outlet of the feed pipe
car·bu·ret·tor carburettors in AM, use carburetor A carburettor is the part of an engine, usually in a car, in which air and petrol are mixed together to form a vapour which can be burned. a part of an engine, especially in a car, that mixes the petrol with air so that it burns and provides power (carburet (19-21 centuries), from carburet (18-19 centuries))