Thirty minutes is about long enough for the oil to get warm and thin out. The pump cannot produce as much pressure AND the thinner oil leaves the bearings faster and lowers the oil pressure.
Also you say you "rebuilt" the oil pump. Not much you can do here EXCEPT sand the probably warped pot metal cover flat. If you didn't do that, then tear into it again and fix the cover. When I do one, I always make a flat metal strap and place it across the cover where the high pressure port is and hold it on with two of the cover bolts.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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