1993 Johnson Evinrude "ET" 9.9 thru 30 Service Manual, P/N 508282, Page 75Get this manual
Disassembly r,Ql1Remove primer pump housing retaining ring from primer
[!!J 2Remove primer plunger from housingDiscard O-ringsInspection 1Inspect brass plunger shaft for any burrs or scratchesRemove small scratches by polishing the plunger with crocus clothIf the plunger has deep scratches, replace the plunger
1212Inspect around cross hole will hole intersects inside holeplunger where cross Any burrs accelerate wear of O-ringsRemove any protruding burrs and polish with crocus clothThe check valve under the small nipple on the primer pump housing allows fuel flow out of the pump housing and prevents flow into the housing