Patent ID: 8545192

Claim:
A diesel pump comprising: a pump housing; a cylinder press-fitted to a holding hole formed at the pump housing; a plunger reciprocably arranged at the cylinder; and a drive mechanism for driving the plunger; wherein the cylinder is a separate component from the pump housing and is attached to the pump housing; an inlet valve seat placed at the outer side in the axial direction of the cylinder; a plug member fastened to the holding hole so as to hold the inlet valve seat and plug the holding hole; an outlet joint attached to the pump housing to discharge fuel from the cylinder, wherein the front end of the outlet joint reaches the cylinder; a fuel discharge route is directly led from the cylinder to the outlet joint not via the pump housing; wherein a cylinder end space is formed among an end face in the axial direction of the cylinder, an inner face of the holding hole and the plug member; the cylinder end space constitutes a part of a fuel supply route to the cylinder; the cylinder includes a joint contact area at the outer circumference; the front end of the outlet joint is located at the joint contact area of the cylinder; a gap is formed at a contact portion of the cylinder and the outlet joint, the gap located between the inner face of the holding hole and the joint contact area; the gap is connected to the cylinder end space.