I have a fuel pressure gauge between pump and regulator( at carb) and a gauge on the regulator at carb. When i turn the adjusting screw in on the pump, neither pressure gauge shows increased pressure, but when i adjust pressure at regulator both pressure gauges show the change in pressure. I dont get it. I thought the regulator at carb only controlled pressure between regulator and carb? Anyone here know how many turns on the pressure screw on the pump when these pumps left the factory pre set to 12psi? I currently have it at 1 full turn out, but not seeing any increase in pressures.