George Lendich wrote:

Paul,
Got a brain teaser for you:-
Considering the Cont FI system and the fact that automotive
systems don't need to run return lines to the fuel tanks for hot
fuel. Why do XA systems need to return hot fuel.

Don't jump in too quick.It's been discussed many times that
hot fuel needs to be returned to tanks to cool. However what
if it doesn't need to be returned in the first place ie. used as
needed. I think if anyone can work it out it's you Bill or Steve
Sharp. I'm led to believe there is an answer and that it is also
value added in regards redundancy, I don't know all the facts.

I bet this gets some interest !!
George (down under)

You might get away with moving the pressure regulator to the
tank in an aircraft system. In that case the return line would be short 
or non-existent.  A pressure regulator by nature is a three port device.
I am not sure why they put it up next to the engine.
Perhaps for throttle response reasons.

With a computer you might be able to pulse width modulate the pump so 
it put out only the pressure and volume needed. You would need a 
pressure sensor of course. Might work in an aircraft with simpler
dynamics. Most people have their hands full just getting the engine
installed properly.

Paul Lamar
 
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