Scott Gettings wrote:

How about when one tank is full and its valve is closed, and you bank into the
other wing, causing its float valve to close also?   It seems that if the
"full" tank valve did not instantly and always open, then  positive pressure
would build up, holding both valves closed with no reason for them to re-open.

Of course, slightly leaky valves that just created a pressure differential
would prevent this problem, but it would seem that a tightly-sealing or
slow-to-unseal float could be a problem.

Scott Gettings

You mean slip. If you bank in a coordinated manner the gravity
vector is perpendicular to the bottom of the fuselage

Good point. That would preclude putting the valve outboard.
If the valves were inboard slipping would not hurt as the down 
wing valve would uncover. The balls should be weighted so they 
just float with clearance around them so they don't stick.
 
Paul Lamar
 
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