Paul wrote:

This I think is what George Lendrich had in mind.
IMHO it is a major breakthrough in simple fuel
injection systems for  low wing airplanes.

When one tank is full the ball check valve closes in that
tank and return fuel is automatically routed to the other tank.

It does not interfer with the vent lines and a separate cross
over line can be used.

Paul Lamar

Bulent Aliev wrote:

I may be missing something? If both tanks are filled to the top, both ball
valves will be closed shut. Where the return fuel will be going?

More is always taken out then goes back in.

The devices will need to be in the outboard part of a wing
with dihedral so the fill level is just below the ball.

In the case of a straight wing Velocity type airplane a modification 
of this idea might be wise with a hose coming out of the top of the 
device going into the tank. The device would then be slightly higher than 
the tank and be mounted on the out side of the tank in the cockpit.
In fact this would work with all types of wings.
 
Paul Lamar
 
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