Page 21 - WM E-Learning Handbook

Module 3: Low-Pressure CNG Fuel System Components

Learning Objectives
1. Identify the major low-pressure CNG fuel system components
2. Describe the purpose of each low-pressure CNG fuel system component

Slide Topic Content Notes
Low-Pressure Components
 Pressure regulator
(low-pressure side)

 Pressure gauge
 Fuel lines
 Low-pressure coalescing filter
 Mixer
 Optional components

 Mechanical fuel gauges
 Shut-off solenoid valves

Pressure Regulator – Low  Set at OEM specified
Pressure Side pressure for engine operation

 Fuel pressure specification
programmed into the ECU for
optimal engine performance
and emissions

 125 psi for Cummins engines
(not adjustable)

Low-Pressure Gauge and Low-  Low-pressure gauge displays
Pressure Fuel Pressure
Transducer pressure of fuel on the way

to the engine

 Pressure transducer
 communicates pressure

to engine control module
 Located on the engine

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