<P> A carburetor (American English) or carburettor (British English; see spelling differences) is a device that blends air and fuel for an internal combustion engine in the proper ratio for combustion . It is sometimes colloquially shortened to carb in the UK and North America or carby in Australia . To carburate or carburet (and thus carburation or carburetion, respectively) is to blend the air and fuel or to equip (an engine) with a carburetor for that purpose . A buret or burette is equipment for measuring liquids accurately . </P> <P> Carburetors have largely been supplanted in the automotive and, to a lesser extent, aviation industries by fuel injection . They are still common on small engines for lawn mowers, rototillers and other equipment . </P>

What is the function of the wick at the bottom of the quad
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