Page 30 - AFVi CNG & LNG Participant Guide

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

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