1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Manual, Page 63Get this manual
Description of Fuel System r.jl1 The 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" situation2The 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 circuits