The FI system has a fuel return line to
return unused fuel pumped to the engine back to the wing tank(s).

Is this dumb, or is there a good reason not to return fuel to the tank
whence it came, in this case, the ferry tank?

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.