Abstract
A marine propulsion system is provided with a valve (2) for automatically mixing fuel and oil for a two cycle crankcase compression internal combustion engine. The valve operates on a pressure differential, such as that supplied from the suction intake vacuum side of a fuel pump. Fuel is alternately and cyclicly directed by a transitioning shuttle spool valve (50) through respective transfer passages (34, 38) to opposite sides of a diaphragm (24) to drive the diaphragm in reciprocal movement such that in a first half cycle the diaphragm is driven in one direction and expels fuel from its one side, and in the second half cycle the diaphragm is driven in the other direction and expels fuel from its other side. A plunger (48) operatively couples the diaphragm to the directional shuttle spool valve through spring biased lost motion detent means (52). The directional shuttle spool valve is actuated between its alternate positions near the end of the plunger travel stroke in each direction. An oil pump (44) is connected to the plunger and pumps oil during each of the opposing directions of plunger movement.
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