Part Type: Fuel Injection Pressure Regulator. Fuel Injection Pressure Regulator. 2008 Lexus IS F Engine: 5.0L V8;. 2009 Lexus IS F Engine: 5.0L V8;. Pressure Reg. System Pressure: 38. California Proposition 65: WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or reproductive harm.