Kohler Company

Lawrence J Bernauer

Roger T Gault

Alvin P Fenton

A starting mixture control for a carburetor that controls the richness of the fuel mixture being fed to an associated engine after initial starting, the carburetor having a throat for supplying air to the engine that is equipped with a choke valve upstream from a venturi constriction, a throttle valve downstream from the venturi constriction, a fuel bowl with a fuel nozzle opening into the throat at the venturi constriction, a bowl vent passage for providing atmospheric pressure to the fuel bowl during normal engine operation, and a pressure transmitting by-pass duct communicating between the bowl vent passage and the carburetor throat. When the engine is cranked with the choke closed a rich fuel mixture is delivered to the engine, and when the engine starts the duct transmits the low pressure on the downstream side of the choke valve to the fuel bowl to reduce the flow of fuel from the fuel nozzle to lean out the fuel mixture delivered to the engine to prevent stalling until the choke valve is adjusted to an open position.

Carburetor starting mixture control

A carburetor having a venturi constriction within an air passage leading to the engine intake manifold, a fuel bowl with a discharge nozzle for delivering fuel to the venturi constriction, and a bowl vent passage between the fuel bowl and a position at atmospheric pressure, includes a duct communicating between the venturi constriction and the fuel bowl. A solenoid valve is disposed in the bowl vent passage and is operatively connected to the ignition; the valve is open when the ignition is turned on so that the fuel bowl is exposed to atmospheric pressure allowing the nozzle to discharge fuel into the venturi constriction, and it is closed when the ignition is turned off. With the valve closed, the pressures in the venturi constriction and the fuel bowl are equalized preventing the flow of fuel through the nozzle to the venturi constriction and inhibiting 'dieseling' after ignition shut-off.

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Kohler, WI, United States of America

Lawrence J Bernauer