1992 Johnson Evinrude "EN" 60 thru 70 Service Manual, P/N 508144, Page 60Get this manual
Description of Fuel System , ", 1The unit is combination mechanical fuel and oil pump, powered by crankcase pressure and vacuum pulses, which responds to various engine power settings by injecting the proper amount of oil into the fuel systempumps incorporate circuit that warns the operator of fIno oil" situationf21 2The carburetors meter and distribute the fuel consumedThey control engine speed and power output by varying the intake charge densityTo react correctly to wide range of operating conditions, the carburetors have several discrete fuel mixing circuits[";1 3On electric start models, mixture enrichment for cold starting is controlled by fuel primer solenoidWhen acti vated at the key switch, the solenoid diverts some output directly to the intake manifolds6718