Often times the pump is dry on a motor that has set awhile and the pump won't suck oil since it is turning to slowly. I remember as a kid we sometimes had to prime our outside pump to get water. Just a suggestion. Rather than pulling parts off the motor, maybe you could construct a rig to put oil into the sending unit hole so that all you have to do is pull the sending unit itself. I once did this by pulling the sending unit on a Desoto hemi and inserting a pipe thread fitting for a 3/8" hose. Then I put a container of oil hanging from the ceiling of the garage with a gallon of oil in it and just let it bleed in through head pressure. This oil will find it's way down to the pump and create the prime you need. Once the container was dry. ( which took awhile ), I drained the oil and then refilled the motor with fresh oil. The engine rattled for a few seconds but It worked just fine after that. Bill
