I'm going with the cracked pick up tube. Even if the top drain holes were clogged, I don't think it could pump all the oil up top in 45 seconds! If it were that clogged it would be sucking oil up the PCV and blowing oil in the breather box.
Thinking the crack is just below the "engine off" fill level. When the engine starts the level drops below the crack, the pump gets a mix of air and oil, pressure drops, lifters get full of air. Possibly the engine hasn't been hurt yet since it does build pressure temporarily, assuming there is no bottom end knock.
Even if the pick up screen were clogged, every one I ever looked at had a bypass feature that would open and let oil flow to the pump. Problem is, the oil going through the bypass can contain large, hard chunks that can lock the pump, twist the shaft, then no oil at all.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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