Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 158Get this manual
An arrow is clearly visible on the squeeze bulb to indicate the direction of fuel flowThe sqeeze bulb MUST be installed correctly in the line because the check valves in each end of the bulb will allow fuel to flow in ONLY one directionTherefore if the squeeze bulb should be installed backwards (in moment of haste to get the job done), fuel will not reach the carburetor7- To replace the bulb, first unsnap the clamps on the hose at each end of the bulbNext, pull the hose out of the check valves at each end of the bulbNew clamps are included with new squeeze bulbIf the fuel line has been exposed to considerable sunlight, it may have become hardened causing difficulty in working it over the check valveTo remedy this situation simply immerse the ends of the hose i boiling water for few minutes to soften the rubber and the hose will then slip onto the check valve without further problemsAfter the lines on both sides have been installed, snap the camps in place to secure the lineCheck second time to be sure the arrow is pointing in the fuel flow direction, TOWARDS the engine