Slant Six Flooding

Flooding dual carb setup update. So I went for a long drive with a thermal gun. Made it to where it acted up yesterday with a warmer day. Fuel lines "cold", bowls about 135F should be no problem and there was not. Made it to the small town I made it to yesterday and fine. Decided to make a run to the "big town". Made it there and went through several stop signs no problem. Did a u-turn and slowed to turn into the Auto Body Supply store and blurble-stall gas smell... Jump out and gun the carbs, 145F and "cold" fuel lines. WTF. Chatted with the store owner for a while and made it all the way home before it started acting up again... made it in the garage and shut it down and temped it.. 130F carb bowl and "cold" fuel lines.... double WTF. pulled the air-cleaners and the rear carb it smoking in the bore... gas spitting in through a hole in the bore.... mmmm.. Not hot... fuel pressure.. started to crack an AN-6 fitting at the fuel filter and lots of pressure still after shut down a few minutes. Ok pressure problem, fuel pump.... put the air cleaners back on started to walk in the house and the light bulb came one... how can there be that much pressure after the pump this long after shut down? There can't. Turned the fuel cap and "psssssst" as the pressure escaped! Eureka! Now to figure out why since I have the breather pipe in the trunk stuffed into the filler neck and out through the rubber boot in the filler tube trunk seal...... Note, it acted up worse the other day right after I filled the tank to the top for the first time... I am now down to a half a tank.