1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 77Get this manual
Assembly 1Position the spring and washer on the plunger shaft2Install three new a-rings onto plunger shaft3Install new a-ring onto the end cap and position the end cap on the plunger shaft4 Insert plunger shaft and end cap into primer pump housing Reinstall retainer clip 5To bench test the primer pump after assembly, connect in piece of hose to the large nipple and place the other end of hose in container of alcoholPlace hose on the small nipple and place other end of hose to drain into containerHold primer pump in horizontal position as it would be installed on the engineMove plunger back and forth ten times Primer should pump approximately 10 cc of alcohol in ten strokesIf pump fails to pump alcohol, disassemble and check for missing, cut, or split a-rings or damaged check valves