Found the air leak! The tank shutoff petcock which I never close. I took out the tank pickup tube, again, removed the screen
and had no blockage in the tube. I blew through the tank vent. No problem. I replaced the 30 year old tank shutoff with a brass pipe nipple. Problem went away. I did this on Sunday. Started ran at the dock
, put in gear
, turned it off, restarted several times. Waited 45 min. Did it all again. Yesterday, after sitting nearly 48 hours restarted without bleeding, sailed for 2 hours and started again without incident.