1997 Johnsoon Evinrude "EU" 50 thru 70 3-Cylinder Service Manual, P/N 507266, Page 84Get this manual
Primer System Servicing Functional Test
VRol Models
1Start engine and allow it to reach normal operating temperatureSet engine speed at 2000 RPM2While engine is running, push in key Engine should run richly and drop 1000 RPM3Remove air silencer assembly
4Remove primer hose from any intake manifold or carburetor primer fitting that you suspect is cloggedConnect 1fs inch 1.0clear vinyl hose between the fitting and syringe filled with isopropyl alcohol5Press lightly on the syringe If fluid moves through the fitting, it is okay