Diaphragm carburetor for internal combustion engine

Abstract

A diaphragm carburetor with a fuel metering chamber designed for easy restart when hot which includes a separate escape chamber connected to the metering chamber having a second diaphragm controlled exhaust valve. The second diaphragm is subject to positive crankcase pressure during engine operation to maintain the exhaust valve closed. When the engine is stopped, the exhaust valve is opened by a spring and fuel in the metering chamber will move into the escape chamber and out of the carburetor rather than be forced into the fuel mixing passage and venturi of the carburetor. A porous absorbent material is positioned to receive the fuel leaving the open exhaust valve and to retain it until it vaporizes and dissipates through openings in the retainer atmosphere. The exhaust valve may be manually operated as an option.

Dependencies are inferred from the claim text.