1995 Johnson/Evinrude Outboards 9.9, 15 four-stroke Service Manual, Page 56Get this manual
Primer System Servicing Function Test 1Start engine and allow it to reach normal operating temperatureSet engine speed at 2000 RPM2While engine is running:
Electric start modelsPush key inEngine should run richly and drop 1000 RPM
3Remove primer hose from any primer fitting that you suspect is cloggedConnect l in1.0clear vinyl hose between the fitting and syringe filled with isopropyl alcohol4Press lightly on the syringe plunger