Thank you for the explanation. I do have a another question however. So disconnecting the vacuum from the pressure regulator should be left open to the atmosphere while you adjust the fuel pressure, so a "zero-vacuum setting (vacuum is eliminated at wide-open throttle) of 39 psi could be achieved. While the fuel pressure "drop" with the introduction of vacuum to the regulator varies from car to car, roughly 4 or 5 pounds of fuel pressure once the vacuum line was reattached. If going about it this way, how would this effect my WOT?