1998 Johnson Evinrude "EC" 125C, 130, 200, 225, 250 90 deg LV Service Manual, P/N 520212, Page 82Get this manual
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Description of Outboard Fuel System
The VRO pump assembly is combination mechanical fuel and oil pumps and fueloil mixer powered by rankcase pressure and vacuum pulsesThe VRO pump injects the proper amount of oil into the fuel system
The VRO pump incorporates circuit in the electrical module that warns the operator of "NO OIL" situation
The VRO pump for the 200 commercial outboard is fuel only pump[] The conventional fuel pump is of the diaphragmdisplacement type and is operated by changes in crankcase pressure[] The carburetors distribute and meter the fuel to the engineThey control the 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 circuitsV8 outboards are equipped with fuel manifold bypass valveIf the output of one VRO fuel pump is reduced, the bypass valve will open and allow the other pump to supply fuel and oil to both fuel manifoldsOne pump may not supply enough fuel for full throttle operation, but it will allow part throttle6716