Posted for "terrence o'neill" <troneill@charter.net>:

 Scott,
 Thanks.  Interesting.  If oen of your two Facets should fail, can you access
that tank's fuel?
 I was thinking of two lines from wing to header, the pumps after a tee
crossflowing to a crossflow valve on the other line.
 But if one tank was dry, do you think that would pull so much air into the
working pump it couldn't feed the header?
 Pumps powered by the header fuel level sensor(s). Why not just one sensor ---
and a manual switch option?
 Terrence
 L235/320
 N211AL