COMBINED FLUID PRESSURE ACTUATED FUEL AND OIL PUMP

Disclosed herein is an oil pump including a movable element reciprocal through a given distance for pumping oil in response to reciprocation of the element, a variable volume oil pumping chamber including an oil inlet and an oil discharge, and mechanism for varying the output of the oil pump notwithstanding the reciprocation of the element through said given distance, which mechanism for varying the oil pump output includes an oil piston defining, in part, the oil pumping chamber, and linkage connecting the element and the piston for displacing the piston in response to movement of the element and for permitting lost motion between the element and the piston.