Patent ID: 6901912

Claim:
A variable delivery fuel supply device which comprises: a fuel injection valve for injecting fuel to respective cylinders of an internal combustion engine, a fuel pump which sucks fuel from a fuel intake port through an intake valve into a pressurizing chamber by a reciprocating movement of a plunger in a cylinder to pressurize the fuel and supplies the pressurized fuel into the fuel injection valves through a discharge valve, a damper chamber having a pressure damper, which is communicated with the fuel passage at a position between the fuel intake port and the intake valve in the fuel pump, a relief passage for communicating the pressurizing chamber of the fuel pump with said fuel passage, and an electromagnetic valve for opening and closing the relief passage, which is adapted to control an amount of pressurized fuel to be supplied to the fuel injection valves by relieving pressurized fuel in the pressurizing chamber to said fuel passage at the time of opening the valve, wherein the damper chamber having a pressure damper is formed integrally with the fuel pump, and wherein the relief passage is communicated with the fuel passage between the damper chamber, including a pressure damper, and the intake valve.