Page 22 - WM E-Learning Handbook
P. 22

Slide Topic                       Content                               Notes
Low-Pressure Fuel Lines
                                 Color-coded
                                 Carry gas from the regulator

                                    to the mixer
                                 Flexible fuel hose
                                 Depends on manufacturer’s

                                    choice
                                 Vehicle may have either rigid

                                    or flexible or both

Low-Pressure Coalescing Filter   WM Cummins ISL G engines
                                    use 1 filter

                                 WM Cummins ISX 12 G use 2
                                    filters

                                 Filtration after the regulator
                                    to protect engine, sensors,
                                    spark plugs, and catalytic
                                    convertor from oil or water

                                 Also filters particulates

                                 Can be manually drained

                                 Maintenance procedures
                                     Drain daily – max 1 oz.
                                         (29.5735 mL)
                                         accumulation
                                     Replacement schedule –
                                         see service literature

Fuel Mixer for Cummins Engines   Fuel-control valve meters gas
                                    flow

                                 Mixer blends air, fuel, EGR

Fuel Mixer for Mack E7G          Pulse-width modulated
                                    gaseous fuel injectors on a
                                    fuel metering valve

Technician Safety and Awareness Training for NGVs  © 2018 NGVi All Rights Reserved         Page 20
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