1998 Johnson Evinrude "EC" 40 thru 55 2-Cylinder Service Manual, P/N 520206, Page 72Get 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 Testing this section, for specific repair proceduresTesting Procedure
& To avoid accidental starting of engine while changing propellers, twist and remove all spark plug leadsINotel Some checks require that the engine run at full throttle
under loadInstall the correct test propeller and run the engine in suitable test tank1Start engine and allow it to reach normal operating temperatureStop engineI Note Push hose off pump fittingsdon'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