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5-2 FUEL AND LUBRICATION SYSTEM
FUEL SYSTEM
The fuel pump is operated by a vacuum force which is supplied from the carburetor intake pipe. The fuel sent
under pressure by the fuel pump flows into the float chamber when the float of the carburetor has dropped
and the needle valve is open. When the needle valve closes, the pressure of the fuel in the hose connecting
the carburetor and the fuel pump increases, and when the set pressure is reached, the operation of the fuel
pump is stopped by the fuel pressure to prevent excessive supply.
FUEL PUMP
Vacuum pulsations from the carburetor intake pipe are used to operate the pump diaphragm A. When vacuum
is applied to the diaphragm A, fuel is drawn from the tank into the diaphragm’s chamber B. As positive
pressure is applied, the diaphragm backs, pushing the fuel through the outlet to the carburetor.
A series of check valves (1 and 2) is used in the fuel flow route to allow the fuel to move in only one
direction, through the pump body.
To intake pipe
From fuel valve
To carburetor
If the fuel pressure in the chamber of carburetor side is too high,
the return valve 3 is opened so that the fuel pressure is released
to the chamber of fuel cock side.
FUEL
VACUUM
FUEL
2


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