ISO 20766-4:2018
(Main)Road vehicles - Liquefied petroleum gas (LPG) fuel system components - Part 4: Level indicator
Road vehicles - Liquefied petroleum gas (LPG) fuel system components - Part 4: Level indicator
This document specifies general requirements and definitions of liquefied petroleum gas fuel components, 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. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 This document applies to devices which have a service pressure in the range of 110 kPa (Butane rich at 20 °C) and 840 kPa (Propane 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 4: Indicateur de niveau
General Information
- Status
- Published
- Publication Date
- 25-Nov-2018
- Technical Committee
- ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 22-Apr-2024
- Completion Date
- 13-Dec-2025
Overview
ISO 20766-4:2018 - "Road vehicles - Liquefied petroleum gas (LPG) fuel system components - Part 4: Level indicator" specifies requirements, definitions and tests for LPG level indicators used on road vehicles (mono‑fuel, bi‑fuel or dual‑fuel) as defined in ISO 3833. The standard covers general design principles, marking and instructions, and functional and safety tests for devices operating in the LPG service pressure range of 110 kPa to 840 kPa (adjustable by ratio for other pressures). It excludes fuel containers, stationary gas engines, container mounting hardware, electronic fuel management and refuelling receptacles.
Key topics and requirements
- Scope and definitions: Applies to LPG level indicators for motor vehicles using gaseous fuels per ISO 9162. Pressure references are gauge pressures unless stated otherwise.
- Marking and traceability: Components must be marked with manufacturer/agent identification, model/part number and working pressure (or pressure and temperature range). Recommended markings include flow direction, fuel type, electrical ratings, certification symbol, type approval number and serial/date code.
- Construction and electrical protection: Level indicator construction must comply with ISO 20766-1/2; electrical connections shall meet IP54 (IEC 60529).
- Functional and durability tests:
- Hydrostatic strength: tested at 2.25 × working pressure (WP).
- Leakage: specified test temperatures and pressure factors (e.g., −40/−20 °C at 0.75×WP and 0.025×WP; 20 °C at 0.025×WP and 2.25×WP; 85 °C at 0.05×WP).
- Continued operation: 6 000 cycles between empty and 80% tank valve cut‑off; readings must remain within declared tolerance and component must pass hydrostatic retest.
- Insulation resistance for electrical variants: apply DC 1 000 V between connector pin and housing for ≥2 s; minimum allowable resistance 240 kΩ.
- Float pressure test: floats must withstand 3 000 kPa external pressure.
- Other applicable tests: leakage, excess torque resistance, bending moment, corrosion, vibration, temperature cycling and material compatibility as referenced in ISO 20766-2.
Applications and users
Who uses ISO 20766-4:2018:
- LPG component manufacturers and designers - for product design, marking and test requirements.
- Automotive OEMs and system integrators - to select compliant level indicators for LPG vehicles.
- Test laboratories and certification bodies - to perform required hydrostatic, leakage, electrical and durability tests.
- Regulators, procurement teams and aftermarket suppliers - to verify safety, traceability and type‑approval for vehicle LPG fuel systems.
Practical uses include product development, type‑approval testing, compliance documentation, procurement specifications and installation/maintenance guidance for LPG vehicle fuel systems.
Related standards
- ISO 20766 series (Parts 1 and 2 referenced)
- ISO 3833 (vehicle categories)
- ISO 9162 (gaseous fuels)
- IEC 60529 (IP Code)
- EN 12806, EN 589 (see bibliography for additional references)
Frequently Asked Questions
ISO 20766-4:2018 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - Liquefied petroleum gas (LPG) fuel system components - Part 4: Level indicator". This standard covers: This document specifies general requirements and definitions of liquefied petroleum gas fuel components, 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. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 This document applies to devices which have a service pressure in the range of 110 kPa (Butane rich at 20 °C) and 840 kPa (Propane at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).
This document specifies general requirements and definitions of liquefied petroleum gas fuel components, 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. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 This document applies to devices which have a service pressure in the range of 110 kPa (Butane rich at 20 °C) and 840 kPa (Propane at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).
ISO 20766-4:2018 is classified under the following ICS (International Classification for Standards) categories: 43.060.40 - Fuel systems. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 20766-4:2018 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 20766-4
First edition
2018-11
Road vehicles — Liquefied petroleum
gas (LPG) fuel system components —
Part 4:
Level indicator
Véhicules routiers — Équipements pour véhicules utilisant le gaz de
pétrole liquéfié (GPL) comme combustible —
Partie 4: Indicateur de niveau
Reference number
©
ISO 2018
© ISO 2018
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
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Phone: +41 22 749 01 11
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Published in Switzerland
ii © ISO 2018 – All rights reserved
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 . 2
6.1 Applicability . 2
6.2 Hydrostatic strength . 3
6.3 Leakage . 3
6.4 Continued operation . 3
6.5 Insulation resistance . 4
6.6 Float pressure test . 4
Bibliography . 5
Foreword
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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
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iv © ISO 2018 – All rights reserved
INTERNATIONAL STANDARD ISO 20766-4:2018(E)
Road vehicles — Liquefied petroleum gas (LPG) fuel system
components —
Part 4:
Level indicator
1 Scope
This document specifies general requirements and definitions of liquefied petroleum gas fuel
components, 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
...
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