1990 Johnson Evinrude "ES" Cross V 88 thru 115, 150 thru 175, P/N 507874, Page 60Get this manual
Description of Fuel System tJ powered by crankcase pressure and vacuum pulses, which
responds to various engine power settings by injecting the proper amount of oil into the fuel systemunits incorporate circuit that warns the operator of "no oil" situationThe 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 circuitsMixture 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 manifoldsSome 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 pointf21 1The unit is combination mechanical fuel and oil pump,