4. FUEL AND LUBRICATION SYSTEM
4-1 FUEL TANK AND FUEL COCK
When the engine has started. a negative pressure(vacuum pressure)is generated at the intake port.the
negative pressure acts upon the diaphragm of the fuel cock and it presses 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 passageway is closed.and not fuel
flows to the engine.
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