1998 Johnson Evinrude "EC" 40 thru 55 2-Cylinder Service Manual, P/N 520206, Page 84Get 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 RPM
3Stop engineRemove air silencer assembly
4Remove primer hose from any intake manifold or carburetor primer fitting that you suspect is cloggedConnect 18 in1.0clear vinyl hose between the fitting and syringe filled with isopropyl alcohol5Press lightly on the syringe If fluid moves through the fitting, it is okayIf fluid does not move through the fitting, clean with OMC Nipple Cleaning Tool, PIN 326623