Page 30 - CNG/ LNG ESP Participant Guide 2024
P. 30

Module 3: Low-Pressure CNG Fuel System Components

             Pressure Regulator
             (Low-Pressure Side)                                                ▪  Set at OEM specified pressure
                                                                                   (Cummins natural gas engines
                                                                Fuel Shutoff       range from 60-125 psi)
                                                                 Solenoid             o  Not adjustable
                                                                                ▪  Fuel pressure specification
                                                                                   programmed into the ECU for
                                                                                   optimal engine performance and
                                                                                   lowest emissions






             Low-Pressure Gauge
             and Low-Pressure
             Fuel Pressure
             Sensor









                                                            Low-Pressure Gauge











                                                                                  Transducer







                                  ▪  Low-pressure gauge displays the pressure of the fuel on the way to the engine
                                  ▪  Pressure transducer communicates pressure to engine control module (ECM)


             Low-Pressure Fuel    ▪  Carry gas from the regulator to the fuel rail (LD) or engine (HD)
             Lines                ▪  Can be made of rigid or flexible materials
                                       o  Depends on manufacturer’s choice
                                       o  Can be both materials on the same vehicle












                                           NGV Essentials and Safety Practices (CNG & LNG)                            © 2024 AFVi All Rights Reserved    Page 3-3
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