I have a partially completed 360, and have decided to
extend the wing tanks.  Unfortnately, the wings are already
closed, with tank sealer applied.

The previous owner built an access panel into the outboard
wing compartment, which will now be the extension tank, so it will be
fairly easy to install the new gas caps. I can seal the interior,
and close the panel with sealer.


The part I am unsure about is installing the two flow channels (one for
fuel, one for vapor) that extend from the each current tank, passing
through the aileron bell crank area, to the extension tanks.

I was thinking of using 1.5 inch 6061 tubing for this, but
I dont want the seals at the ends to crack with flexure.

Or, i could lay up a carbon channel,  but then i need figure out how to
seal the inside of that channel.

and I guess I need flapper valves.

Has anyone out there faced this challenge?

Any advice?

-Jeff Peterson
N273CK