Carburetor starting mixture control

Details Carburetor starting mixture control Carburetor starting mixture control

1979-08-02

1981-03-03

Miles, Tim R.

Gas and liquid contact apparatus

Fluid distribution

Valved

261 72R, 261DIG67, F02M 508

Patent

active

042540640

ABSTRACT:
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.

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