Page 23 - AFVi CNG & LNG Participant Guide

Module 2: High-Pressure CNG Fuel System Components

Defuel Receptacle  Connection to the defueling hose that
and Valve allows gas to be removed from the
high-pressure fuel system

Three-way
Valve

Receptacle

High-Pressure Fuel Flexible Fuel Line
Lines, Tubing and
Fittings

Rigid Fuel Line
(Stainless-Steel)

 Carry gas from the receptacle to the cylinder, and to the high-pressure side of the
regulator
 Can be made of rigid or flexible material
 May have both materials on the same vehicle

Fittings: O-Ring Face
Seal and Double Double Ferrule Fitting O-Ring Face Seal Fitting
Ferrule
Nut
Back Ferrule O-Ring

Front Ferrule
Fitting

 Connect sections of high-pressure tubing to each other and/or components
 Double Ferrule – most commonly used

NGV Essentials and Safety Practices (CNG & LNG) © 2024 AFVi All Rights Reserved Page 2-5