Abstract: Apparatus for continuously lubricating a pumping unit engine having exposed valve and rocker arm means positioned at one end thereof comprising a housing adapted to be attached to the engine over the valve and rocker arm means for preventing dust and other foreign matter from depositing thereon, the housing including at least one lubricant flow passageway disposed in the top thereof positioned over the valve and rocker arm means when the housing is attached to the engine and a lubricant reservoir sealingly connected to the lubricant flow passageway in said housing whereby lubricant contained in the reservoir flows by gravity through the lubricant flow passageway in the housing and onto the valve and rocker arm means of the engine.

Abstract: A method and apparatus for controlling the fluid pumping rate of an internal combustion engine driven pumping means taking suction from a zone of fluid under pressure whereby a substantially constant fluid pressure is maintained within said zone. The vacuum produced by the internal combustion engine is utilized to change the speed of the engine and the vacuum level is varied in proportion to changes in the pressure of fluid in said zone.

Abstract: A method and apparatus for controlling the liquid pumping rate of an internal combustion engine driven pump taking suction from a surge tank whereby a substantially constant level of liquid is maintained within the surge tank. The vacuum produced by the internal combustion engine is utilized to change the speed of the engine and the vacuum level is varied in proportion to changes in the level of liquid in the surge tank.