1997 Johnson Evinrude "EU" 40 thru 55 2-Cylinder Service Manual, P/N 507265, Page 75Get this manual
Assembly
1Position the spring and washer on the plunger shaft
l1ID 2Install two new a-rings and quad-ring onto plunger
3Install new a-ring on the end cap, and position the end cap on the plunger shaft4Insert the plunger shaft and end cap into the primer pump housingReinstall retainer clip
5To bench test the primer pump after assembly, connect in(127 mm) piece of hose to the large nipple and place the other end of hose in container of alcoholConnect hose to 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 timesPrimer 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&