1992 Johnson Evinrude "EN" 60 deg Loop V Service Manual, P/N 508146, Page 51Get this manual
Description of Fuel System f1l 1The 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 circuitsCarburetor calibration is controlled by an idle air bleed orificean intermediate air bleed orificeand high speed fuel orifice
Fuel 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 pump during start-up chamber provides liquid fuel to the and operation
121 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 silencer