Improved fuel injection pump assembly

The utility model relates to the technical field of diesel engine fuel supply system manufacture, and particularly to an improved fuel injection pump assembly. The fuel injection pump assembly mainly comprises a plunger bushing. The structural characteristic is that: the plunger bushing is formed by integral casting, a fuel inlet pipe is arranged at the side part, and a fuel outlet valve seat is in screwed connection with the plunger bushing; a fuel outlet valve spring is arranged in the inner cavity of the fuel outlet valve seat and is tightly pressed on the shoulder blade surface of a fuel outlet valve; the conical surface of the fuel outlet valve is in sealed connection with the conical surface of the fuel outlet valve seat; a plunger is slidably mounted at the lower part of the inner cavity of the plunger bushing, a clearance groove is formed at the middle par of the plunger, and a spring lower seat is hung at the small head of the plunger; and a plunger spring is tightly pressed on the spring lower seat,