Invented in 1893, the carburettor was the preferred method of supplying fuel to car engines until the advent of fuel injection. In the 1970s, fuel injection began to replace carburettors in many popular car models. Carburettors came in a variety of forms but the basic principle which governed their action was the same. In a carburettor the amount of fuel supplied to the engine is controlled by air flow. The faster the air moves the lower its pressure. The carburettor uses this principle to determine the necessary mixture of air and fuel sucked into the engine.

Geoff Barker, April 2008

References
http://en.wikipedia.org/wiki/Carburetor
http://sec.edgar-online.com/2000/02/10/16/0000908255-00-000008/Section4.asp

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