Add to Favorite Sellers. Holley 512-502 Stock Replacement Adjustable Fuel Pressure Regulator. Street/Strip EFI Applications Fits 1994-97 LT1/LT4 Camaro/Firebird and 1994-95 LT1 Impala SS Adjustable from 35 to 65 PSI; Holley fuel injection pressure regulators are designed to provide the correct fuel pressure for any high performance fuel injected vehicle. Regulators for dedicated applications are offered in various colors. These each feature a range of adjustability from 35-65 PSI. They are made to bolt in the stock location, so installation is a snap! Customer Service & Feedback. So we have a chance to make it right – we want your repeat business! Check out the official Holley Performance. For more great deals!!