I recently rebuilt my Powersteering pump and it has started leaking fluid from the rear of the pump. The old one was leaking from the front seal. I know that rear door is held on by a snap ring which is tight and the spring inside holds pressure on the door against the snap ring. There is no rubber seal there. How do I get this leak to stop?

Has anyone had the same problem. I replaced both O rings inside the pump and the front seal.
1982 300sd.

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup