1995 Johnson Evinrude "EO" 9.9 thru 30, 2-Cylinder Service Manual, P/N 503146, Page 69Get this manual
Primer System Servicing Function Test
1Start engine and allow it to reach normal operating temperatureSet engine speed at 2000 RPM
2While engine is running:
Electric start modelsPush key inEngine should run richly and drop 1000 RPM
Manual start modelsStroke primer knobEngine should run richly and drop 1000 RPM
]] 3Remove primer hose from any primer fitting that you suspect is cloggedConnect Va inI.Dclear vinyl hose between the fitting and syringe filled with isopropyl alcohol4Press lightly on the syringe plunger