1971 Evinrude Fisherman 6HP outboards Service Manual, Page 16Get this manual
LEAF VALVES The leaf ture into pressure termined ure 3-1valves time the injection of the the crankcase by opening only in the crankcase has dropped to point on the compression strokefuel mixwhen the predeSee Fig-
MANUAL CHOKE The carburetor is fitted with manual choke to reduce the ratio of air to fuel for cold startsA choke valve in the air inlet of the barrel is mounted to choke shaftWhen the choke knob is pushed in, the valve is held open, allowing air to pass freely through the inletWhen the choke knob is pulled out, the valve is closed, restricting the flow of air to the carburetor
The tank air inlet and fuel outlet are seated until the supply line connector is plugged into the tankWhen the fuel line is attached, two valve plungers are depressed, forcing the valves off their "0" ring seatsThis vents the tank to the atmosphere and opens the fuel outlet"0" ring seals in the fuel connectors shut off fuel flow when the line is disconnected from the tank or motorTo facilitate draining and cleaning, drain screw has been provided in the fuel tank upper housing