1)number of cylinders of an injection pump,喷油泵油缸数目2)single cylinder fuel injection pump,单缸喷油泵3)single cylinder camshaft less fuel injection pump,单缸式喷油泵4)multicylinder fuel injection pump,多缸燃油喷射泵5)pumping element spacing,喷油泵缸心距6)filling of injection pump,喷油泵格数
