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You want to run a big as possible return line (at least as big as the feed line anyway). The regulator will take car of the pressure. But, if the return line is too small, it will result in a back pressure. Lets say the back pressure is 3 psi. So you set the regulator for another 4 psi for a total of 7. This is fine for crusing. However, when you step into it and start using all the fuel, the 3 psi restriction goes away because you are now using all the fuel - no fuel left to be return. When this happens, the regulator drops to 4psi - what you actually set it at. Obviously this will create a problem of not enough fuel pressure at WOT. Clear as mud? I think the Barry Grant website has some really good tech on the subject
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