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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
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