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MPROP FCA Injection Pressure Regulator Fuel Pressure Regulator Fuel Control Actuator Measuring Unit. The function of the injector pressure regulator is to control the output pressure of the high pressure CP3 fuel pump. When the part fails, the actual fuel pressure will not match the desired fuel pressure as specified by the engine computer. Both pressures can be monitored on a scan tool and compared. The most common symptom as the part begins to fail is varying / unstable idle. 5.9L Cummins MPROP / FCA Fuel Presure Regulator Replacement Vehicle Type Compatibility: Dodge Ram Cummins Diesel 5.9L 2003 2004 2005 2006 2007 Cummins Fuel Control Actuator replaces the following part numbers: 0928400666 4932457 5183245AA