1996 Johnson/Evinrude Outboards 50 thru 70 3-Cylinder Service Manual, Page 65Get 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 "NO OIL" situation
rn 2.controlcarburetors meterand power output fuelvarying the The and distribute the consumedengine speed by They
intake charge densityTo react correctly to wide range of operating conditions, the carburetors have several discrete fuel mixing circuits671 8