So while i had my engine out i decided to do some improvements on the cp3 on my engine.
One of the things i did was make a 1/2 fuel fitting for the supply for the cp3.
Most of the 1/2 fuel fittings you see out there are still too restrictive because it bottlenecks down to a smaller fitting when it reaches the part that threads into the pump.

The stock 3/8 fitting Has an inner diameter of .232" with equates to about .0422 square inches.

The modified fitting i made was pieced together with a half inch ac line fitting and a M12x1.5 to jic. i cut the jic part off and welded the ac fitting on to it and that took care of the 1/2 inch hose part.

The M12x1.5 fitting on the other side still had to be taken care of so i bored out the fitting from .232" to .295". i could of probably squeezed out more of it, but i was pushing it already.

The area had increased to .683 inches squared resulting in about a 62% increase of flow capability.

Here are some pictures of the fitting.

Side by side difference:



Size difference between both fittings on the side that goes into the cp3:



the 1/2 inch fuel line attached:



Clearance with a modded wire harness:




Link to discussion thread: