Fuel Pressure Regulator FCA MPROP. Maintains constant fuel pressure to the CP3 High-Pressure Injection Pump+. FCA – Fuel Control Actuator, FPR – Fuel Pressure Regulator, MPROP. THIS UNIT INSTALLS IN THE CP3 HIGH-PRESSURE PUMP. These are also called MPROP’s. The symptoms of a faulty MPROP would be rail pressure that is too high or too […]