cjbiagi wrote:With the simple system I have the return is regulated by a very small orifice built into the fuel filter. I don't know the size but as I mentioned this is a filter for a early 80's Chrysler "K" car which was carburated. I'm guessing the orifice is maybe .030 - .040 or something like that.........you get the idea. This is combined with the stock V8 in tank pump. As mentioned I have been running this for over 30 years and I originally did it to cure a vapor lock symptom on very hot days. I use the original vapor line as my return.
That is such a small hole and being it is before the carb, I really don't see it as having any real impact. Especially not for a mild motor on radials. We ran 11.60 with our bypass system before changing it over. Obviously it ran good, but just not to its fullest potential.