Fuel Lines - What Size?

[jascott]

Does anyone know what size fuel lines the 2011 diesel trucks have? On the 2008, there are two stainless hard lines that run along the driver side framerail. They appear to be 15/32" outside diameter, and probably 3/8" inside diameter???

I have an 08 F-250 6.4L and have a 2011 F-350 6.7 on order. I had a toolbox/fuel tank installed on the 08 which included a fuel tank selector valve that switches between the tanks. I am concerned that this valve may not flow enough fuel on the supply side or the return side. My 2008 6.4L has had somewhat of an "injector rattle" sound under moderate load since the installation of the fuel tank. I have removed the tank and plumbing and the noise seems to be greatly reduced. I really wanted to install this into my new truck, but I don't want any noises or potential damage. This valve installs between the tank(s) and the low pressure fuel pump/filter.

Pollak MOTOR-DRIVEN FUEL TANK SELECTOR VALVE - JCWhitney

What are everyone's thoughts? This setup would give me about 70 gallons of on-board fuel... and I already have everything needed...