Fuel Pressure Regulator (GX470 & LX470)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Lexus SC 430, 2003 Lexus RX 300, 2003 Lexus LX 470, 2003 Lexus LS 430, and 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
Mounted on fuel rail, fuel pressure regulator maintains constant fuel pressure to fuel injectors. As throttle is depressed, voltage to fuel pump is increased to maintain adequate fuel pressure and fuel flow to injectors.