DieselDestruction Duramax LLY CP3 Diesel Fuel Pressure Regulator - 0928400653 (FCA/MPROP) Replaces OE#: GM Part# 97369850 Bosch# 0928-400-653 0928400653 Maintains a constant fuel pressure for fuel that is supplied to the fuel rail. Fuel Rail Pressure Regulator for 2004.5-2005 GMC/Chevy 6.6L LLY Duramax Duramax LLY CP3 Diesel Fuel Pressure Regulator 1 Year Warranty !!!