Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 148Get this manual
FUEL the cylindersInstallation of new hoses to the carburetor is not difficult or expensive taskThe accompanying illustration clearly shows the two hoses connected to the fuel tankThe hose on the left transfers fuel to the carburetor and the hose on the right is the air pressure lineTo assist in identifying the fuel line, the fuel hose has rib extending its full length from the tank to the carburetorThe primer pump is also dearly shown in the illustrationDISASSEMBLING WARNING TAKE EXTREME CARE during work with the fuel tank, because highly flamable fumes are present and the danger of fire or explosion is presentDemand and observe NO SMOKING or open flame in the work areaClean the tank in the out-of-doors1- Check to be sure the knob on the pump shaft is able to rotate on the shaftThe knob is secured to the shaft with cotter pinIf the knob does not turn during operation, the diaphragm in the pump will be damaged or rupturedExplana tion The following description of pump operation may be helpful in explaining how damage to the diaphragm may be caused by failure of the button to turnWhen person operates the pump, the action is not in straight down directionThe natural tendancy is to turn the thumb or hand while operating the plungerThe shaft is connected directly to the diaphragmTherefore, if the knob fails to turn, the shaft will be torn away from the diaphragm