Fuel Pump And Fuel Regulator; Operation - Yamaha XZ550RJ 1982 Service Manual

FUEL PUMP AND FUEL REGULATOR

Operation

The fuel pump diaphragm is operated by variations in the pressure in the carburetor joint and thus produces a
pumping action that pumps fuel from the fuel tank to the carburetor. Fuel is drawn through the inlet and, as
indicated by -», it flows through the inlet and outlet valves and is discharged from outlet. Then, fuel flows into
the carburetor float chamber, and when the fuel level reaches the specified level, the float valve is closed.
When the fuel pressure exceeds a specific level, it forces the regulator valve to open so that excess fuel flows
out into the return circuit, as indicated by - - >, leading to the inlet side of the pump. In this way, a constant fuel
pressure is maintained.
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