Page 31 - CNG ESP Participant Guide2024

Module 3: Low-Pressure CNG Fuel System Components

Low-Pressure ▪ Filters liquids and aerosols from gas
Coalescing Filter o Oil
o Water
▪ Also filters particulates
▪ Can be manually drained
▪ Failure to service can result in expensive
engine, sensor, and component failures

Light-Duty

▪ Multi-port injection (MPI)
o Injector flow capacity is large

Heavy Duty ▪ Cummins natural gas engines use mixer(s) to blend air,
fuel and EGR
▪ Fuel-control valve or continuous flow valve meters gas
flow

Continuous
Flow Valve

Mixer

NGV Essentials and Safety Practices (CNG & LNG) © 2024 AFVi All Rights Reserved Page 3-4