1997 Johnsoon Evinrude "EU" 50 thru 70 3-Cylinder Service Manual, P/N 507266, Page 66Get this manual
Testing Fuel System Purpose The following procedure is designed to help you isolate defective component in the boat or engine fuel systemThe problem might cause loss of engine performance or, if left unrepaired, might cause serious powerhead damageAfter you have isolated the component, refer to Servicing, this section, for specific repair proceduresTesting Procedure
To avoid accidental starting of engine while changing propellers, twist and remove all spark plug leadsunder loadInstall the correct test propeller and run the engine in suitable test tank
INotel Some checks require that the engine be run at full throttle
1Start engine and allow it to reach normal operating temperatureI Note Push fuel hose off fuel fittingsdon't pullIf pushing
won't separate hose and fitting, carefully cut the hose along its side and peel it back to avoid damaging the fittings