George Lendich wrote:

Paul,
Just looking at my 4-way valve and noticed that with the handle pointing to the outlet, both thanks are in feed and both thanks are in return.
When one tank is selected the other is cut off ( for return also)

My Question is- wouldn't the wing tanks self level no matter how much one tank received return fuel (because of some pressure bias), in the both selected option.
George (down under)

Not necessarily. Small pressure differences in the tanks or a slight side slip 
could result in large difference in where the fuel goes. It is dangerous to 
use the "both" position in a low wing airplane. Please don't do it.

Paul Lamar
 
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