ISO 19013-1:2026

International
Standard
ISO 19013-1
Third edition
Rubber hoses and tubing for fuel
2026-08
circuits for internal combustion
engines — Specification —
Part 1:
Diesel fuels
Tuyaux de caoutchouc et flexibles pour les circuits de carburant
pour les moteurs à combustion interne — Spécifications —
Partie 1: Carburants diesel
Reference number
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 2
4  Classification . 2
5 Sizes . 3
5.1 Tubing .3
5.2 Hoses .3
6 Performance requirements for hose and tubing . 4
6.1 General .4
6.2 Burst pressure .4
6.3 Adhesion .4
6.4 Low-temperature flexibility .4
6.5 Internal cleanliness .4
6.6 Extractable waxy materials .4
6.7 Tear resistance (applicable to tubing only) .4
6.8 Ozone resistance .5
6.9 Heat ageing resistance .5
6.10 Resistance to surface contamination by engine oil .5
6.11 Resistance to surface contamination by non-petroleum hydraulic (brake/clutch) fluid .5
6.12 Resistance to kinking .5
6.13 Resistance to suction .5
6.14 Resistance to fuels .6
6.15 Burn-through resistance .6
6.16 Electrical resistance .6
6.17 Life-cycle test (types 1, 2 and 3 only) .6
7 Frequency of testing . . 6
8 Marking . . 6
Annex A (normative) Cleanliness and extractables test . 8
Annex B (normative) Resistance of tubing to tearing . 10
Annex C (normative) Method for determining the resistance to surface contamination .13
Annex D (normative) Life-cycle test . 14
Annex E (informative)  Example of tests of specific application for OEMs .15
Annex F (normative) Type approval tests . .16
Annex G (normative) Routine tests . 17
Annex H (informative) Production acceptance tests .18

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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 45, Rubber and rubber products, Subcommittee
SC 1, Rubber and plastics hoses and hose assemblies.
This third edition cancels and replaces the second edition (ISO 19013-1:2019), which has been technically
revised.
The main changes are as follows:
— inclusion of requirements in Clauses 5 and 6;
— revision of Clause 7.
A list of all parts in the ISO 19013 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 19013-1:2026(en)
Rubber hoses and tubing for fuel circuits for internal
combustion engines — Specification —
Part 1:
Diesel fuels
WARNING — Persons using this document should be familiar with normal laboratory practice. This
document does not purport to address all of the safety problems, if any, associated with its use. It is
the responsibility of the user to establish appropriate safety and health practices.
1 Scope
This document specifies the requirements for rubber tubing and hoses used in diesel fuel circuits for internal
combustion engines. The diesel fuels covered include “bio-diesels” which consist of the methyl ester of rape
seed oil at levels up to 20 % by volume in conventional diesel fuels.
NOTE See Annex E for a detailed description of the “line call-out” used in tests for specific original equipment
manufacturer (OEM) applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1629, Rubber and latices — Nomenclature
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 3302-1, Rubber — Tolerances for products — Part 1: Dimensional tolerances
ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of hoses
and the lengths of hose assemblies
ISO 4926, Road vehicles — Hydraulic braking systems — Non-petroleum-based reference fluid
ISO 6133, Rubber and plastics — Analysis of multi-peak traces obtained in determinations of tear strength and
adhesion strength
ISO 7233:2021, Rubber and plastics hoses and hose assemblies — Determination of resistance to vacuum
ISO 7326:2016, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
ISO 8031, Rubber and plastics hoses and hose assemblies — Determination of electrical resistance and
conductivity
ISO 8033, Rubber and plastics hoses — Determination of adhesion between components
ISO 10619-1:2017, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 1:
Bending tests at ambient temperature

ISO 10619-2:2021, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 2:
Bending tests at sub-ambient temperatures
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
SAE J2027, Standard for Protective Covers for Gasoline Fuel Line Tubing
SAE J2044: 2009, Quick Connect Coupling Specification for Liquid Fuel and Vapor/Emissions Systems
SAE J2260, Nonmetallic Fuel System Tubing with One or More Layers
EN 14214, Liquid petroleum products — Fatty acid methyl esters (FAME) for use in diesel engines and heating
applications — Requirements and test methods
3  Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4  Classification
The product shall consist of extruded rubber materials with or without an integral reinforcement, which
can be pre-formed or non-pre-formed before final vulcanization. The product can also have a rubber or
thermoplastic barrier layer, either as an internal layer or forming the inner liner, to impart improved fluid
resistance or reduced fuel vapour permeability, or both.
Seven hoses and tubings for specific applications are specified, as follows:
— Type 1:
— Class A = Pressurized [0,7 MPa (7 bar) working pressure] feed and return lines from the fuel tank to
the engine compartment (−40 °C to +80 °C continuous);
— Class B = Pressurized [0,2 MPa (2 bar) working pressure] feed and return lines from the fuel tank to
the engine compartment (−40 °C to +80 °C continuous);
— Type 2:
— Class A = Pressurized [0,7 MPa (7 bar) working pressure] feed and return lines in the engine
compartment (−40 °C to +100 °C continuous);
— Class B = Pressurized [0,2 MPa (2 bar) working pressure] feed and return lines in the engine
compartment (−40 °C to +100 °C continuous);
— Type 3:
— Class A = Pressurized [0,7 MPa (7 bar) working pressure] feed and return lines in the engine
compartment (−40 °C to +125 °C continuous);
— Class B = Pressurized [0,2 MPa (2 bar) working pressure] feed and return lines in the engine
compartment (−40 °C to +125 °C continuous);
— Type 4 Low pressure [0,12 MPa (1,2 bar) working pressure] fuel filler, vent and vapour handling
(−40 °C to +80 °C continuous).

5 Sizes
5.1 Tubing
The test shall be carried out in accordance with ISO 4671. The inside diameters and wall thicknesses shall be
as specified in Table 1.
Tolerances shall be selected from the appropriate categories specified in ISO 3302-1: M3 for moulded hoses:
E2 for extrusions.
The thickness of the barrier layer, where applicable, shall be included in the total nominal wall thickness
shown in Table 1.
Table 1 — Tubing inside diameters and wall thicknesses
Inside diameter Wall thickness
mm mm
3,5 3,5
4 3,5
5 4
7 4,5
9 4,5
11 4,5
13 4,5
NOTE The unions on which the tubing is fitted have the following diameters: 4 mm, 4,5 mm, 6 mm or 6,35 mm,
8 mm, 10 mm, 12 mm and 14 mm.
5.2 Hoses
The test shall be carried out in accordance with ISO 4671. The dimensions and concentricity of hoses shall
be in accordance with Tables 2 and 3.
Table 2 — Hose dimensions
Dimensions in millimetres
Inside diameter Tolerance Outside diameter Tolerance
3,5 ±0,3 9,5 ±0,4
4 ±0,3 10 ±0,4
5 ±0,3 11 ±0,4
6 ±0,3 12 ±0,4
7 ±0,3 13 ±0,4
7,5 ±0,3 13,5 ±0,4
8 ±0,3 14 ±0,4
9 ±0,3 15 ±0,4
11 ±0,3 18 ±0,4
12 ±0,3 19 ±0,4
13 ±0,4 20 ±0,6
16 ±0,4 24 ±0,6
21 ±0,4 29 ±0,6
05,
31,5 40 ±1
1
05,
40 50 ±1
1
Table 3 — Hose concentricity
Maximum variation from
Inside diameter
concentricity
mm mm
≤3,5 0,4
>3,5 0,8
6 Performance requirements for hose and tubing
6.1 General
Tests shall be selected from the following list (see Table E.1) for each application of hose or tubing, based on
the performance requirements for the finished product. Type approval tests (as defined in Clause 7) for each
hose or tubing group given in Annex F shall be used.
6.2 Burst pressure
The test shall be carried out in accordance with ISO 1402. The minimum burst pressure for Types 1, 2 and 3,
Class A, shall be 3,0 MPa (30 bar) gauge and for Class B shall be 1,2 MPa (12 bar) gauge. Type 4 shall be
0,5 MPa (5 bar) gauge. Additionally, after fuel resistance testing [test m)], hoses and tubing shall not have a
burst pressure of less than 75 % of the original burst pressure.
6.3 Adhesion
This applies for all constructions with two or more bonded layers only.
The test shall be carried out in accordance with the appropriate procedure in ISO 8033. The adhesion
between each pair of bonded layers shall not be less than 1,5 kN/m.
6.4  Low-temperature flexibility
The test shall be carried out in accordance with ISO 10619-2:2021, Method B. A length of hose or tubing
which has been previously kept filled with ISO 1817 liquid C for 72 h ± 2 h at 21
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