Near new 8N Motor in my 9N. Like less than 20 hours. Fully rebuilt at a shop. Has run fine, 30 lb oil pressure cold, drops down when warm. No noises. Suddenly no pressure. Changed the gauge, since it was old. Still no oil pressure. Pulled out the relief valve - - looks ok - - nothing weird. Turned it over (with coil off) with valve out, no oil comes out. Pump rebuild kit with overhaul. Full of beautiful, clean oil. Again, it has been fine until now. Any Suggestions? Hate to tear it apart without suspecting what I am looking for. Suggestions? Ideas? Oil Pick up?