Carburetor

Claim 1

In combination: a carburetor having a piston type throttle valve defining a carburetor throat of variable cross-section, said cross-section being reduced so that flow of fluid therethrough generates a reduced pressure therein; an upstream air passage for exposure to atmospheric pressure; a downstream mixture supply passage for connection with an intake port of an internal combustion engine, said carburetor throat interconnecting and being placed immediately between said passages; supply means for delivering fuel to said carburetor throat, catching means downstream from said throat for catching liquefied fuel which has deposited on the inner wall of the mixture supply passage and then flowed downstream; and return passage means for conducting the recovered liquefied fuel from the catching means to the carburetor throat by virtue of a difference in pressure between the pressure in the mixture supply passage at the catching means and the pressure in the carburetor throat, said return passage means having a first opening opening directly into the carburetor throat to return said liquefied fuel thereto, the rate of flow of said liquefied fuel being determined by its availability and by the difference between said pressures.