1993 Johnson Evinrude "ET" 60 degrees LV Service Manual, P/N 508286, Page 51Get this manual
Description of Fuel System '11 1The carburetors meter and distribute the fuel consumed
LJ They 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 circuitsCarburetor calibration is controlled by an idle air bleed orificean intermediate air bleed orificeand high speed fuel orifice f21 2Fuel enters the vapor separation chamber through the fuel filterThe chamber allows fuel vapor to separate from the liquid fuelThe vapor is removed from the chamber by the operation of the float valve and vapor pumpThe operation of the float valve is controlled by the amount of fuel in the chamberThe chamber provides liquid fuel to the pump during start-up and operationf21 3The vapor pump is diaphragmdisplacement type, and is operated by changes in crankcase pressureThe vapor pump moves fuel vapor from the separation chamber to the air silencerf31 4The 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 of The fIno oil" situationf21 5Mixture enrichment for cold starting is controlled by fuel primer solenoid When activated at the key switch, the solenoid diverts some pump output directly to the intake manifoldsf31 6The fuel component bracket is equipped with vacuum sensitive switch The switch sounds continuous tone of the warning horn if restrictions in the boat fuel supply system reach critical point