It can happen due to a scratch on the pump face, or line-connector. It can also happen from a small bit of dust stuck in there. I've installed many pumps with new washers, had a small leak, loosened all the lines, let them leak and then retighten - and then all was fine.
I just had to do it with my Case 580CK. Pump crapped out last week. I pulled it off, fixed the pump, and put back on with all new steel washers. One line kept leaking at the pump. I had to loosen it twice (with engine running) and then retighten. It finally cleaned itself out and now is fine.
Had to do the same with my Deere 300B backhoe last summer. It's very easy when fixing and installing pumps - especially outdoors, to get a spec of dirt behind a washer.
By the way, new steel washers are NOT pefectly flat. They have radial sealing-ridges. That why you sometimes need a new washer to fix a leak and NOT a perfectly flat washer. New copper washers ARE flat.
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