Thank you for your info everyone. Back pressure never came to mind when I started to figure out my return line. Like I mentioned previously, I am going with a 3/8 out and return. Now I need some advice as to where to weld the return flange on the side of the tank. On the upper part, lower part or it does not matter.
Raymond

On 2/25/2011 10:26 PM, downing.j@sbcglobal.net wrote:

Raymond, I tried a 1/4" return line and with the regulator backed off completely it had 6 #'s of pressure, way to much for the Weber 48 Carb I have, so I had to go to 5/16", I would have went to 3/8 th's but didn't room at the tank.  JohnD

----- Original Message -----

From: Raymond Lambert

To: Rotary motors in aircraft

Sent: Friday, February 25, 2011 3:19 PM

Subject: [FlyRotary] Fuel return line

I am about to put the fuel tank in my first wing. I have to weld a flange on it for the fuel return line. Anyone can tell me if a 1/4" fuel return line is large enough ????

Raymond