1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Manual, P/N 520210, Page 82Get this manual
Primer System ServicingElectric Start Models Function Test
1Start engine and allow it to reach normal operating temperatureSet engine speed at 2000 RPM
2While engine is running, push key in Engine should run rich and drop 1000 RPMStop engine
[] 3Remove primer hose from any primer fitting that you suspect is cloggedConnect Va in1.0clear vinyl hose between the fitting and syringe filled with isopropyl alcohol[] 4Press lightly on the syringe If fluid moves through the fitting, it is okay