A fuel injection pump is provided. The fuel injection pump includes a barrel including an inner surface defining a bore. The fuel injection pump also includes a plunger movable inside the bore of the barrel. An outer surface of the plunger and the inner surface of the barrel form a clearance therebetween. One or more sleeves at least partially encircle one or more portions of an outer surface of the barrel, and are configured to apply a load to the outer surface of the barrel.