1998 Johnson Evinrude EC 50 thru 70 HP 3-Cylinder Service Manual, Page 81Get this manual
Primer System ServicingElectric Start Models Functional 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 carbu retor primer fitting that you suspect is cloggedConnect 1fa 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 okay