Inventors:
James D. Sparks - Edelstein IL
Dennis M. Ruttle - Washington IL
Assignee:
Caterpillar Inc. - Peoria IL
International Classification:
F02M 3704
Abstract:
A fuel injection pump, preferably for use with relatively large diesel engines employing heavy diesel fuel, includes a pump body that defines a portion of a fuel pressurization chamber in fluid communication with a fuel outlet and a spill passage. The pump body also defines a pressure control chamber and an actuation fluid passage. A spill valve member, which has a pressure surface is exposed to fluid pressure in the pressure control chamber and is moveable between an inject position that blocks the spill passage and a spill position that opens the spill passage. An electronically controlled valve has a control valve member that is moveable between a first position in which the actuation fluid passage is open to the pressure control chamber, and a second position in which the actuation fluid passage is blocked to the pressure control chamber.