Bill Freeman wrote:

Paul,

We discussed this at length some months ago.  I recommend the fuel be
either returned to one tank at all times, or buy the expensive dual
selector to reroute fuel to the originating tank.

The single return is very simple, cheap and light - all very attractive

in

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
tcrook@rotaryaviation.com
www.rotaryaviation.com

Just to be very clear about things.

The Andair EFI valve automatically returns it to the tank you are drawing from.
When you are down to just a few gallons in both or either tank that is when the
temperature of the fuel can bite you and that is when you may really need a 
fuel cooler as Ed Anderson suggests.

The same situation would apply with a header tank.

Has anybdoy circle over the airport until both tanks were near empty?
Has anybody measured the temperature of the return fuel?

BTW Tracy how are you feeling? 

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org