High-pressure fuel pump

A fuel pump comprising:

• a cylinder formed in a pump body,
• a reciprocating plunger installed in the cylinder,
• a pressurizing chamber formed by the cylinder and the plunger, and whose internal volume varies with the reciprocating motion of the plunger,
• a fuel intake passage for feeding fuel into the pressurizing chamber,
• a fuel discharge passage for feeding out the fuel pressurized by the pressurizing chamber,
• a fuel intake valve provided in the fuel intake passage,
• a fuel discharge valve provided in the fuel discharge passage, and
• a connecting passage for connecting between the upstream side of the fuel intake valve in the fuel intake passage and the downstream side of the fuel discharge valve in the fuel discharge passage,
• wherein the connecting passage is provided with a check valve for allowing the fuel to pass from the fuel discharge valve to the fuel intake valve, and
• wherein both ends of said connecting passage are provided with plug-mounting holes on the outer surface of the pump body;
• one of the said plug-mounting holes is equipped with a first blind plug for preventing fuel from flowing out from said connecting passage to the outside of the pump;
• another thereof is equipped with a second blind plug, said check valve serving as a relief valve for the discharged passage pressure relief, and a sealing section for blocking fuel passage between the intake side and the discharge side except the place of said relief valve.

A fuel pump comprising:

• a cylinder formed in a pump body,
• a reciprocating plunger installed in the cylinder,
• a pressurizing chamber formed by the cylinder and the plunger, and whose internal volume varies with reciprocating motion of the plunger,
• a fuel intake passage for feeding fuel into the pressurizing chamber,
• a fuel discharge passage for feeding out the fuel pressurized by the pressurizing chamber,
• a fuel intake valve provided in the fuel intake passage, and
• a fuel discharge valve provided in the fuel discharge passage, and
• a connecting passage for connecting between the upstream side of the fuel intake valve in the fuel intake passage and the downstream side of the fuel discharge valve in the fuel discharge passage,
• wherein the connecting passage is provided with a check valve for allowing the fuel to pass from the fuel discharge valve to the fuel intake valve,
• wherein both ends of said connecting passage are provided with plug-mounting holes on the outer surface of the pump body;
• one of said plug-mounting holes is equipped with a first blind plug for preventing fuel from flowing out from said connecting passage to the outside of the pump;
• another thereof is equipped with a second blind plug, said check valve serving as a relief valve for the discharged passage pressure relief, and a sealing section for blocking fuel passage between the intake side and the discharge side except the place of said relief valve, and
• wherein said first blind plug and said second blind plug are mounted in a single body as said pump body.