1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 70Get this manual
Primer System Servicing Functional Test 1Start engine and allow it to reach normal operating temperatureSet engine speed at 2000 RPM2While engine is running: Electric start modelsPush in keyEngine should run richly and drop 1000 RPM Manual start modelsStroke primer knobEngine should run richly and drop 1000 RPM
t=J is cloggedConnect Va inI.Dclear vinyl hose between the
fitting and svringe filled with isopropyl alcohol4Press lightly on the syringe If fluid moves through the fitting, it is okay