Here's an excellent read for those concerned about oem lift pump requirements and suitability
https://www.dieseltruckresource.com/...d.php?t=138789

And more (ignore the hype!)
http://www.fuelpreporator.com/

 

I read the test procedure and was shocked he didn't realize that the flow numbers would be pretty low considering the 1/8NPT coming out of the pump!

The rest of the system, regardless of the size tube or fittings, wouldn't flow any better than the smallest restriction allowed after the pump. That's just plain ol shade tree engineering.

LoL

 

That would depend on the pressure rating schedule, but compare 1/8"npt to the banjo orifice feeds in the fuel filter head and the CP3