1998 Johnson Evinrude EC 50 thru 70 HP 3-Cylinder Service Manual, Page 69Get this manual
Testing Fuel System Purpose The following procedure is designed to help you isolate defective component in the boat or outboard fuel systemThe problem might cause loss of performance or, if left unrepaired, might cause serious powerhead damageAfter you have isolated the component, refer to VRO Component Servicing, or Fuel Pump Testing65RS, this section, for specific repair proceduresTesting Procedure
To avoid accidental starting of engine while changing propellers, twist and remove all spark plug leadsrequire that the engine run at full throttle under loadInstall the correct test propeller and run the engine in suitable test tank
INote Some checks
1Start engine and allow it to reach normal operating temperatureStop engine
INote Push hose off pump fittings -
don't pullIf pushing won't separate hose from fitting, carefully cut the hose along its side and peel it back to avoid damaging the fittings