Oil pressure drops to 0

I dropped the oil pan down and inspected the pickup tube. The oil pan was clean enough to eat off of and the pick up still looks brand new with no obvious cracks, or trash in the screen.
It’s pretty easy to drop the pan so if the problem is still there after I replace the spring cap on the pump (and tighten it), I’ll drop the pan again and actually pull the pick up tube off and bench inspect it for invisible cracks.