Vapor return primer for carburetors of internal combustion engines

Claim 1

In combination, a vapor return primer and a diaphragm carburetor, the carburetor having a fuel chamber with a high pressure side and the carburetor associated with an internal combustion engine, the vapor return primer comprising: a housing having an inlet and outlet; conduit means coupling said inlet with said fuel chamber high pressure side; second conduit means coupling said outlet with a fuel tank; a resilient flexibe membrane coupled with said housing, said resilient membrane for priming said carburetor such that said membrane is fixed from a first original position to a second compressed position wherein fluid is expelled from said housing into said fuel tank and upon said membrane reflexing back to the first original position fluid is drawn from said carburetor into said housing; and pressure relief means for enabling fluid to pass into said fuel tank while said membrane is being compressed and preventing said fluid from entering said fuel tank when said memberane reflexes to said first original position, and for regulating pressure of said carburetor enabling fluid to flow from said carburetor to said fuel tank while pressure in said carburetor is at a desired pressure while said engine is running, said pressure relief means coupled with said outlet and said housing.