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FUEL SWITCH
When the engine has started, a negative pressure (vacuum) is generated at the intake
port. The negative pressure acts upon the diaphragm of the fuel switch and it pressed
down the spring which supports the diaphragm so that the fuel passageway is opened
and fuel is fed to the carburetor.
When the engine has stopped, the spring presses the valve, the fuel passageway is
closed, and no fuel flows to the engine.
Fuel switch
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