I'm plumbing a return line finally, and am leaning towards using braided line and AN fittings for (at least) the body run of the line and possibly separate lengths between the body and the motor and the tank and body. The original fuel line size is 7mm (~0.27 in). I have 0.25 line on it now. With the slight differences in AN line fittings, I'm just curious what you guys are running. -4 has an ID of 0.22 inches, while the more common -6 is 0.34 inches. Any issues fitting -4 line over the original carb fittings or fuel tank feed fitting? Thanks.