ISO 20766-8:2023

Road vehicles - Liquefied petroleum gas (LPG) fuel system components - Part 8: Fuel pump

This document specifies general requirements for the fuel pump component of liquefied petroleum gas fuel, intended for use on the types of motor vehicles as defined in ISO 3833. It also provides general design principles and specifies requirements for instructions and marking. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using gaseous fuels in accordance with ISO 9162. It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of the ISO 20766 series, including testing to the appropriate functional tests. All references to pressure in this document are considered gauge pressures unless otherwise specified. This document applies to device which have a service pressure in the range of 110 kPa (butane rich at 20 °C) and 840 kPa (propane rich at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).

Véhicules routiers — Équipements pour véhicules utilisant le gaz de pétrole liquéfié (GPL) comme combustible — Partie 8: Pompe à carburant

General Information

• Status: Published
• Publication Date: 05-Feb-2023
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
• Drafting Committee: ISO/TC 22/SC 41/WG 6 - Fuel system components and refuelling connector for vehicles propelled by Liquefied Petroleum Gas (LPG)
• Current Stage: 6060 - International Standard published
• Start Date: 06-Feb-2023
• Due Date: 24-Jun-2022
• Completion Date: 06-Feb-2023

Overview

ISO 20766-8:2023 is an international standard specifying the general requirements and design principles for fuel pump components used in liquefied petroleum gas (LPG) fuel systems in road vehicles. This standard applies to LPG fuel pumps intended for motor vehicles as defined by ISO 3833 and supports mono-fuel, bi-fuel, and dual-fuel applications utilizing gaseous fuels in accordance with ISO 9162. The document excludes fuel containers, stationary gas engines, mounting hardware, electronic fuel management, and refuelling receptacles from its scope.

Key focus areas of ISO 20766-8 include construction, assembly, marking, and performance testing of LPG fuel pumps intended to operate within specific pressure ranges relevant to butane- and propane-rich LPG blends. The standard ensures safety, reliability, and compatibility of LPG fuel pumps in automotive applications.

Key Topics

• Scope and Applicability
  Details the types of vehicles and LPG fuel systems to which the standard applies, explicitly excluding certain components such as fuel containers and refuelling receptacles.

• Marking Requirements
  Each LPG fuel pump must have clear and indelible markings including:

  • Manufacturer’s name or trademark
  • Model designation or part number
  • Working pressure and temperature range
  • Fabrication date (year and month)
    Recommended additional markings include direction of flow, fuel type, electrical ratings, certification symbols, and relevant ISO reference.

• Design and Construction

  • Fuel pumps must withstand maximum operating pressures, typically within 110 kPa to 840 kPa gauge pressure, adjustable by ratio for other pressures.
  • Electrical insulation is mandated to prevent sparking, ensuring isolation of electrical systems from LPG-containing parts with insulation resistance >10 MΩ.
  • Protection against environmental factors with electrical connections complying with IP40 protection degree (IEC 60529).
  • Safety design to prevent outlet pressure exceeding 3,000 kPa or component working pressure under fault conditions such as tubing blockage by automatic pump shutdown or LPG recirculation.

• Testing Requirements
  Fuel pumps are subjected to rigorous tests to verify safety and durability including:

  • Hydrostatic strength testing at 2.25 times the working pressure.
  • Leakage tests under high and low temperature conditions with a maximum allowable leak rate of 15 cm³/h after conditioning at temperature extremes.
  • Additional tests like external leakage, corrosion resistance, LPG compatibility for non-metallic materials, and temperature cycling may apply.

Applications

ISO 20766-8:2023 is primarily designed for manufacturers and engineers involved in the development and certification of LPG fuel pump components for road vehicles. Its practical value includes:

• Vehicle manufacturers ensuring the integration of safe and compliant LPG fuel pumps within mono-fuel, bi-fuel, or dual-fuel vehicle configurations.
• Component suppliers designing fuel pumps to meet strict performance, safety, and marking criteria to facilitate global market acceptance.
• Regulatory bodies and certification agencies leveraging this standard to assess conformity of LPG fuel system components to international safety and quality benchmarks.
• Maintenance and repair sectors benefiting from standardized marking for correct replacement and ensuring compliance with safety norms during servicing.

The standard supports the safe expansion of LPG-fueled vehicles, promoting environmentally friendly alternatives while maintaining reliability and regulatory compliance.

Related Standards

• ISO 20766 Series
  The LPG fuel system component series, where:

  • Part 1 covers general requirements and definitions for LPG components.
  • Part 2 addresses performance and general test methods for LPG fuel systems.
    Other parts detail various LPG system components and testing protocols ensuring comprehensive system safety.

• ISO 3833
  Defines vehicle types and terminology relevant to the scope of LPG components in motor vehicles.

• ISO 9162
  Specifies the classification and specifications for LPG gaseous fuels used in motor vehicles.

• IEC 60529
  Specifies the degree of protection provided by electrical enclosures (IP Code), relevant for ensuring appropriate electrical safety and environmental protection of LPG fuel pump components.

---

Adhering to ISO 20766-8:2023 is crucial for automotive LPG fuel pump design, ensuring safe, reliable, and test-verified components that comply with global safety standards. Implementing this standard enables stakeholders to advance the adoption of LPG as a clean, efficient automotive fuel alternative.

Standards Content (Sample)

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 20766-8
ISO/TC 22/SC 41
Road vehicles — Liquefied petroleum
Secretariat: UNI
gas (LPG) fuel system components —
Voting begins on:
2022-11-01
Part 8:
Voting terminates on:
Fuel pump
2022-12-27
Véhicules routiers — Équipements pour véhicules utilisant le gaz de
pétrole liquéfié (GPL) comme combustible —
Partie 8: Pompe à carburant
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 20766-8:2022(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2022

ISO/FDIS 20766-8:2022(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 20766-8
ISO/TC 22/SC 41
Road vehicles — Liquefied petroleum
Secretariat: UNI
gas (LPG) fuel system components —
Voting begins on:
Part 8:
Voting terminates on:
Fuel pump
Véhicules routiers — Équipements pour véhicules utilisant le gaz de
pétrole liquéfié (GPL) comme combustible —
Partie 8: Pompe à carburant
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 20766-8:2022(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
NATIONAL REGULATIONS. © ISO 2022

ISO/FDIS 20766-8:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Markings . 2
5 Construction and assembly .2
6 Tests . 3
6.1 Applicability . 3
6.2 Hydrostatic strength . 3
6.3 High temperature . . 3
6.4 Low temperature . 3
Bibliography . 4
iii
ISO/FDIS 20766-8:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicl
...

INTERNATIONAL ISO
STANDARD 20766-8
First edition
2023-02
Road vehicles — Liquefied petroleum
gas (LPG) fuel system components —
Part 8:
Fuel pump
Véhicules routiers — Équipements pour véhicules utilisant le gaz de
pétrole liquéfié (GPL) comme combustible —
Partie 8: Pompe à carburant
Reference number
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Markings . 2
5 Construction and assembly .2
6 Tests . 3
6.1 Applicability . 3
6.2 Hydrostatic strength . 3
6.3 High temperature . . 3
6.4 Low temperature . 3
Bibliography . 4
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects for gaseous fuels.
A list of all parts in the ISO 20766 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
INTERNATIONAL STANDARD ISO 20766-8:2023(E)
Road vehicles — Liquefied petroleum gas (LPG) fuel system
components —
Part 8:
Fuel pump
1 Scope
This document specifies general requirements for the fuel pump component of liquefied petroleum gas
fuel, intended for use on the types of motor vehicles as defined in ISO
...

ISO/DISFDIS 20766-8:20212022(E)
Date: 2022-01-1310-17
ISO TC 22/SC 41
Secretariat: UNI
Road vehicles — Liquefied petroleum gas (LPG) fuel system components —
Part 8: Fuel pump
Véhicules routiers — Équipements pour véhicules utilisant le gaz de pétrole liquéfié (GPL) comme
combustible — Partie 8: Pompe à carburant
Partie 8: Pompe à carburant
ISO/DIS FDIS 20766--8:20212022(E)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no
part of this publication may be reproduced or utilized otherwise in any form or by any means,
electronic or mechanical, including photocopying, or posting on the internet or an intranet, without
prior written permission. Permission can be requested from either ISO at the address below or
ISO's member body in the country of the requester.
ISO Copyright Office
CP 401 • CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: [e-mail]
Website: www.iso.org
Published in Switzerland.
ii © ISO 20212022 – All rights reserved

ISO/FDIS 20766-8:2022(E)
Contents        Page
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Markings . 2
5 Construction and assembly. 2
6 Tests . 3
6.1 Applicability . 3
6.2 Hydrostatic strength . 3
6.3 High temperature . 4
6.4 Low temperature . 4
1 Scope . 4
2 Normative references . 4
3 Terms and definitions…. 5
4 Markings. 5
5 Construction and assembly. 5
6 Tests. 6
6.1 Applicability………………………………………………….…………………………………6
6.2 Hydrostatic strength………………………………………………………………………….7
6.3 High temperature……………………………………………………………………….……7
6.4 Low temperature…………………………………………………………………………….7
ISO/DIS FDIS 20766--8:20212022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national
standards bodies (ISO member bodies). The work of preparing International Standards is
normally carried out through ISO technical committees. Each member body interested in a
subject for which a technical committee has been established has the right to be represented on
that committee. International organizations, governmental and non-governmental, in liaison
with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance
are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria
needed for the different types of ISO documents should be noted. This document was drafted in
accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see
www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. ISO shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in
the Introduction and/or on the ISO list of patent declarations received (see
www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and
does not constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee
SC 41, Specific aspects for gaseous fuels.
A list of all parts in the ISO 20766 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html.
iv © ISO 20212022 – All rights reserved

FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 20766-8:2022(E)

Road vehicles — Liquefied petroleum gas (LPG) fuel system components —
Part 8: Fuel Pumppump
1 Scope
This document specifies general requirements and definitions for the fuel pump component of
liquefied petroleu
...