Page 31 - AFVi CNG & LNG Participant Guide

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

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