Reciprocable plunger fuel injection pump

A reciprocable plunger fuel injection pump comprising a pumping plunger reciprocable within a bore from which it extends, a spring abutment mounted about the outer end of the plunger, said spring abutment being of generally cylindrical form and having a flange for engagement by a spring, a stepped bore defined in the abutment and into which the outer end portion of the plunger extends, the outer end of the plunger being of part spherical form, a thrust member carried by the spring abutment for engagement with the outer end of the plunger, an inclined annular surface formed by the step in the bore, said surface inclining outwardly towards the thrust member, and a ring defining a part spherical surface engageable with said inclined surface carried by the plunger, the portion of the spherical surface of the ring which engages with said inclined surface lying on the projected portion of a sphere of which the part spherical end of the plunger forms part, whereby the thrust member and spring abutment can rock relative to the plunger under the action of forces applied to the thrust member.