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Full Description


This is the fourth edition of CSA/ANSI NGV 6.1, Compressed natural gas (CNG) fuel storage and delivery systems for road vehicles. It supersedes the previous edition published in 2021, 2018, and 2016. The following are the major changes to this edition: 1) streamlined the fire test to make it more user friendly; 2) allowed other component Standards (R110, ISO 15500) to be used on an interim basis to allow current manufacturers to meet this Standard; and 3) clarified requirements for French translations for Canada. The first edition of CSA/ANSI NGV 6.1 was a Recommended Practice that provided a recommended standard practice for vehicle fuel systems. It was written in mandatory language to accommodate its adoption by anyone wishing to do so. The second edition transitioned to a National Standard. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of Natural Resources Canada. This Standard was prepared by the Subcommittee on Vehicle Fuel Systems for Natural Gas, under the jurisdiction of the Technical Committee on Natural Gas Transportation and the Strategic Steering Committee on Transportation, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. 


1.1 Applicability This Standard applies to the design, installation, inspection, repair, and maintenance of the fuel storage and delivery system used as a provision for motive power. This Standard specifically addresses a) on-road vehicles (highway vehicles); b) off-road vehicles (mining and construction); and c) powered industrial trucks (forklifts and TUGs). Note: This Standard is intended to cover the fuel storage and delivery system as defined in Figure 1. Elements downstream of the regulation device(s) or stage(s) such as the low-pressure delivery line and injectors are not included in the Scope of this Standard. 

1.2 Exclusions and future editions 

1.2.1 Exclusions 

This Standard does not apply to a) stationary engines; b) mobile equipment using natural gas as a fuel for other than propulsion; c) electronic control module or controls strategy of a fuel management system; d) storage or utilization of natural gas on marine vessels or rail vehicles; e) liquefied natural gas (LNG) fuel storage systems; or f) compressed natural gas (CNG) gaseous portion of LNG vehicles. 

1.2.2 Future editions 

Future editions of this Standard might include a) LNG fuel storage system; b) CNG portion of an LNG vehicle; c) storage or utilization of natural gas on boats or trains; d) recreational all-terrain vehicles; and e) motorcycles. 

1.3 Pressure references 

All references to pressure throughout this Standard are to be considered gauge pressures, unless otherwise specified. 

1.4 Canadian requirements 

Annex G contains French translations for systems markings required for Canada. 

1.5 Units of measurement 

The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only. Notes: 1) IEEE/ASTM SI 10 or ISO 80000-1 can be used as a guide when converting US units to metric units. 2) Where the word "gallon" is used in this Standard, it indicates a U.S. gallon equivalent to 3.785 L water capacity. 

1.6 Terminology 

In this Standard, "shall" is used to express a requirement, i.e., provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.


Document History

  1. CSA /ANSI NGV 6.1:24

    👀 currently

    Compressed natural gas (CNG) fuel storage and delivery systems for road vehicles

    • Most Recent
  2. CSA ANSI NGV 6.1:21

    Compressed Natural Gas (CNG) fuel storage and delivery systems for road vehicles, Includes Update No. 1 (2023)

    • Historical Version
  3. CSA ANSI NGV 6.1-2018

    Compressed Natural Gas (CNG) fuel storage and delivery systems for road vehicles

    • Historical Version
  4. CSA NGV 6.1-2016

    Compressed Natural Gas (CNG) fuel storage and delivery systems for road vehicles

    • Historical Version