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Module 3: Low-Pressure NGV Components
Fuel Rail and Fuel
Injectors (LD)
▪ Multi-port injection (MPI)
o Injector flow capacity is large
Fuel Mixer – Heavy ▪ Used on Cummins natural
Duty gas engines
▪ Fuel-control valve meters
gas flow
▪ Fuel mixer blends air,
fuel, EGR
Light-Duty ▪ Bi-fuel NGV – same components
Emissions Controls as gasoline
o EGR
o Catalytic converter
o EVAP system
▪ Dedicated NGV
o EGR on most
o Catalytic converter
o No EVAP system
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