1978 Johnson 4HP outboards Service Repair Manual P/N JM-7803, Page 19Get this manual

1978 Johnson 4HP outboards Service Repair Manual P/N JM-7803, Page 19

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DESCRIPTION FUEL FLOW The fuel system consists of fuel tank, fuel pump, and carburetorThe fuel tank is non-pressurized, suction operated diaphragm-displacement type fuel pump the motor draws fuel from