Joe's fuel system has a perfect way to purge air.

Excellent system.

Except... I am not sure why you would run the wings to the belly.

Would it not be better to run the wings and the belly to a selector and then to your aft header?

That way you could empty your belly first and then select the wings.

For me, I know there was a Lancair that came apart in a thunderstorm, and if I had the choice,

I would rather have the fuselage as lightweight as possible in turbulence. (leave the weight where the lift is).

 

Also, since there is chatter about vapors being more dangerous than fuel,

maybe,

but, I would rather land gear up on an empty tank than a full one. How about you?