The present invention relates generally to variable discharge pumps, and specifically pumps used in fuel injection systems. Typically, such pumps include a dedicated spill control valve for each pumping plunger, that also doubles as an avenue for refilling...

A fuel injection pump, comprising a plurality of plungers and a cam shaft having a plurality of drive cams (31, 32) installed in correspondence with the plungers, wherein the cam shaft is rotated by a power from the outside so as to reciprocate the plurali...

A multiple stage pump having valves upstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations and shot to shot fuel variations.