Bill Freeman wrote:

Much simpler than the double ganged valves is the mode used by
(at least) older Bonanzas - all returned fuel goes to a single (right?)
main.  If you don't burn this one down first, i.e. ALWAYS take off on
it, you will be pushing fuel out the vent.  Not too tough an operational
limitation to avoid all the extra stuff to buy, install and fail

Bill

 
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