January 2024. I finally saw the errors of my ways regarding the fuel seystem.
I had no “low point drain”
New plan: from each fuel tank the line runs forward just above the door and down the forward windshield post.
The lines are ar teed together just above the surge tank and then a single line drops down the the tank inlet. After that everything stays the same with a main shutoff on the line coming out of the surge tank before going forward and through the firewall to the gascolator.