1992 Johnson Evinrude "EN" 90 deg. Cross V Service Manual, P/N 508145, Page 60Get this manual
Description of Fuel System f21 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 systempump incorporates circuit that warns the operator The of "no oil" situationf31 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 separate fuel mixing circuitsf41 3Mixture enrichment for cold starting is controlled by fuel primer solenoidWhen activated at the key switch, the solenoid diverts some pump output directly to the intake manifoldsf5l 4Some models are equipped with vacuum sensitive switch which sounds continuous tone of the warning horn if restrictions in the boat fuel supply system reach critical point