"Corky Scott" wrote in message
...

snip


The designer implied that this is a standard aviation design (the
different locations for the fuel outlets).


Dunno about others but in the few I've had occasion to help build-

The PA-12 has outlets only at the aft end of the tank. This worked great
for our use, banner towing, as most our flying was at high AoA (though,
since the gauge was at the FORWARD end of the tank they didn't work after
30-45 minutes).

The PA-18 has pickups at both ends, then feeds into a Y fitting, that then
goes to a header tank (small 1 gal) then to the selector valve. Worked
even better.