Raceworks Adjustable EFI Fuel Pressure Regulator FPR Kit E85 9.5mm 3/8. Raceworks Billet Adjustable Fuel Pressure Regulator. With a Black anodised aluminium finish and E85 ready, this billet fuel pressure regulator is suitable for the most demanding applications including turbo and supercharged. Fully adjustable pressure (40-70psi) with dual AN -6 inlets, and an AN -6 return, this is a very flexible regulator for single and dual rail installs in street, strip and race applications. This fuel pressure regulator has a 1:1 rising rate and is compatible with all fuels including E85. This kit comes with everything needed to fit the regulator to most cars with 3/8? / 9.5mm fuel lines, and includes. Raceworks FPR-501 700hp Fuel Pressure Regulator. Raceworks RWF-414-06-06BK AN -6 to 3/8? Barb for the supply. Raceworks RWF-414-06-06BK AN -6 to 3/8? Barb for the return, and. Raceworks RWF-814-06BK AN -6 plug for the spare port. Comes with mounting bracket and 1/8? NPT gauge port. Use our Raceworks 0-120psi Fuel Pressure Gauge. Raceworks part number: FPR-501-KIT. We have prepared answers to our most frequently asked questions. Performance is an Australian, family run company that sells genuine, quality performance parts from Bosch, Walbro, Turbosmart, Raceworks, BMC, Siemens, Nason, Permaseal, Fel-Pro, ARP and more, including Fuel Pumps, Fuel Injectors, Air Filters, Wideband O2 sensors, Wastegates, BOVs, Surge Tanks, Hose, AN Fittings and more. We also sell J3 Chips, Programmers, and DIY Tuning Kits to tune Ford E-Series (EA, EB, ED, EF, EL), XG and XH Falcon, Fairmont, Fairlane, XR6 and XR8 models.