Vapor-free carburetor

Claim 1

In a carburetor having a diaphragm control fuel inlet valve leading to a diaphragm chamber in which there is a fuel chamber above the diaphragm from which fuel is fed to a mixing passage through a main jet passage and through supplemental jet passages for idling, that improvement which comprises: a. a carburetor housing having a diaphragm chamber and a diaphragm across said chamber, means forming a mixing passage adjacent said chamber, and a valve controlled fuel inlet passage between said chamber and a fuel supply passage leading to said chamber, b. a fluid vapor pump associated with said carburetor housing including a housing means for supporting a pump diaphragm having chambers on each side of said pump diaphragm, said housing having an inlet and outlet means leading to one of said chambers and having a pulse passage to receive engine pulses leading to the chamber on the other side of said pump diaphragm, and one-way valves at said inlet and outlet means, c. means connecting an inlet of said fluid vapor pump chamber with said diaphragm chamber at a point spaced above said diaphragm and above the normal fuel level of fuel in said diaphragm, and d. means connecting said outlet of said pump chamber to a fuel tank.