H&R rebuilt my fuel injector pump and did a fantastic job. I've never had them do a feed pump rebuild--I do my own--so I can not comment on how they do on those. I can tell you from my own experience rebuilding many, many of these, that the pumps should be gone through completely with all the wear parts replaced, such as the bearings, seals, brushes, tab washer with snap ring, woodruff key etc. Parts replacement should also include a rewound armature with a replacement commutator if it is deeply scored or worn down. If not rewound, it should be replaced with a donor armature that is in better shape. In order to avoid any leakage, it is critical that the bellows seal be in good shape, properly stretched to put pressure on its mating surface in the pump housing and the small o-ring at the top of the seal properly sized in order to seal the top of the bellows-new bellows seals are NLA. If a rebuild is done in this way, there is every reason to expect the pump will perform satisfactorily for a very long time.
George