Bill,

   You've touched upon a consideration that I'd run into
in designing my fuel system.  I'm using an adaptation of
Marc and Nadine Parmelee's COZY:

http://www.marcnadine.com/fuelvalve.html

   They weren't running EFI, however and didn't have to
plumb for a return line.  Since my take-off procedure
will be to run both tanks simultaneously, I needed
a regulator capable of handling the total flow (minus
consumption at idle) of both pumps.  Assuming a 1/4" feed,
my return lines needed to be 3/8".

Dale R.
COZY MkIV #1254


> From: WRJJRS@aol.com
> Date: 2005/01/23 Sun PM 08:53:19 EST
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Ah Ha! Pressure Regulator Problem?
>
> Ed, There are two parts to this equation. First: Does the regulator flow
> enough by itself. Second: and almost as important is the plumbing itself. Some
> people will use very small return plumbing. That plumbing can restrict flow,
> keeping the fuel presure high. Another thing for the new people to remember, be
> sure your return switches with your tank valve. There have been accidents where
> the return flow wasn't switched and the tank ran dry. (Always on final of
> course)
> Bill Jepson