FASS Adjustable Fuel Pressure Regulator Universal Gas / Diesel FPR-1001. BRAND NEW IN BOX. FASS FUEL SYSTEMS ADJUSTABLE FUEL PRESSURE REGULATOR (FPR-1001). The FASS Fuel Systems Adjustable Fuel Pressure Regulator is intended for aftermarket performance applications requiring higher fuel pressures than a typical daily driver. These applications can vary from drag race vehicles, competition pulling trucks or high performance marine applications. For your convenience we have pre-drilled and tapped a fuel pressure gauge port that will make adjusting your regulator simple, eliminating any guess work. As an added performance benefit, we have also engineered a boost compensation port. This will allow you to run a line from your manifold to increase fuel pressure, very beneficial when under active acceleration and fuel demand has been increased. Gas or Diesel Applications. Built In Fuel Pressure Port. ½ Inch Fuel Lines. CP Cometic ACL Ferrea and ARP Kits. Custom Made Package Deals. Head and Main Studs. Your address must be confirmed. Buyers who pay with unconfirmed addresses will not be accepted. We always look to satisfy our customers in whatever needs they may have.