aircraft parts.  This system does mandate TO and initial operation on
that tank until enough fuel has been burned down to deal with the
pax possible return flow from another tank.  This was used on (at least)
older Bonanzas, and works just fine.  No transfer pump is required,
just a bit of care in fuel managment.

SNIP<

I'd be very careful with this approach.  The return flow rate is MUCH higher
with EFI than the mechanical A/C engine stuff.  Return fuel flow in my
installation runs from 15 to 30 GPH.  Do the math and you will see that fuel
management will be a bigger pain than installing a transfer pump.

Tracy Crook

Bill Freeman wrote:

YIKES!    Why in the world is the excess (return flow) up to nearly three
times the fuel flow necessary to produce 150 HP??  Seems like the
fuel pump puts out about 4 times the necessary flow rate.  Certainly excess
capacity is a good thing, but is there such a thing as too much of a
good thing?  With this level of return fuel, I would agree that the Bonanza
design is not a good idea.   The Bonanza only needs to be run about
an hour on the initial tank (IIRC) to avoid venting fuel overboard.  The
Andair dual selector seems the safest with this fuel pump size.

Is this excess flow rate planned or just how it works out with an
available pump?

Bill

I think it is for super rich full throttle acceleration Bill. Still sounds
a bit much. Tracy has mentioned 20 GPH full power full rich fuel burn rate.

Paul Lamar
 
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