Fuel Pressure Regulator (All Models)
WARNING: This page is about a different car, the 2003 Lexus SC 430, 2003 Lexus LS 430, 2003 Lexus IS 300, 2003 Lexus GS 430, and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
All models use a returnless fuel system and are not equipped with a fuel pressure regulator on fuel rail. Fuel pressure regulator is mounted to fuel pump assembly and is located in fuel tank. To check in tank fuel pressure regulator, perform FUEL PRESSURE test under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article.