Fuel pump

A fuel pump comprising:

• a pump head;
• a plunger barrel that is provided with a support hole and in which one end portion side of the support hole in an axial direction is fastened to the pump head;
• a plunger that is supported by the support hole so as to be movable along the axial direction;
• a pressurization chamber partitioned by one end portion of the support hole and one end portion of the plunger in the axial direction;
• a fuel discharge channel of which one end portion communicates with the pressurization chamber;
• a fuel suction channel of which one end portion communicates with the fuel discharge channel;
• and
• a recess portion that is provided on at least one of an inner surface of the one end portion of the support hole or an outer surface of the one end portion of the plunger,
• on a lower end surface of the pump head, an accommodation hole is provided that communicates to the fuel discharge channel,
• the plunger barrel is fastened to the pump head by allowing a plurality of bolts to penetrate the pump head and allowing tip portions of the bolts to be screwed around the support hole in the plunger barrel,
• the plunger barrel includes a small diameter portion and a large diameter portion on an outer peripheral surface,
• the large diameter portion provided from the small diameter portion to an one end side in the axial direction in the plunger barrel, has an outer diameter larger than the small diameter portion,
• the large diameter portion is disposed inside the accommodation hole, and the large diameter portion is supported by the accommodation hole;
• taking the one end portion side in the axial direction of the support hole or plunger as the upper side and the other end portion side as the lower side,
• a lower end position of the recess portion is located, in the lower side with respect to a screwing position of the plurality of bolts in the plunger barrel, in the upper side with respect to a lower end position of a respective pilot hole of each of the plurality of bolts in the axial direction of the plurality of bolts, and in the upper side with respect to a lower end position of the large diameter portion in the axial direction of the plunger barrel.