ISO 13948-2:2016

Diesel engines - Fuel injection pumps and fuel injector low-pressure connections - Part 2: Non-threaded (push-on) connections

ISO 13948-2:2016 specifies requirements for the connection ends of push-on connections used with fuel injection equipment. Three types of push-on connections (types A, B and C) are described in this document.

Moteurs diesels — Raccords basse pression pour pompes d'injection de combustible et porte-injecteurs de combustible complets — Partie 2: Raccords non filetés (à pression)

General Information

• Status: Published
• Publication Date: 07-Dec-2016
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 34 - Propulsion, powertrain and powertrain fluids
• Drafting Committee: ISO/TC 22/SC 34/WG 2 - Injection equipment
• Current Stage: 9599 - Withdrawal of International Standard
• Start Date: 16-Aug-2024
• Completion Date: 13-Dec-2025

Relations

• Revised: ISO 13948-2:2024 - Diesel engines - Fuel injection pumps and fuel injector low-pressure connections - Part 2: Non-threaded (push-on) connections
• Effective Date: 06-Jun-2022
• Revises: ISO 13948-2:2012 - Diesel engines - Fuel injection pumps and fuel injector low-pressure connections - Part 2: Non-threaded (push-on) connections
• Effective Date: 05-Nov-2015

Overview

ISO 13948-2:2016 - Diesel engines - Fuel injection pumps and fuel injector low-pressure connections - Part 2 covers requirements for non-threaded (push-on) low-pressure connections used in diesel engine fuel systems. The standard defines the design features, dimensional limits, surface quality and designation rules for three push-on connection types: Type A (nipple), Type B (stand pipe) and Type C (quick connector / male tube end form). ISO 13948-2:2016 complements the threaded-connection part (ISO 13948-1) and references ISO 4288 for surface texture measurement.

Key topics and technical requirements

• Connection types: Detailed definitions and principle drawings for Type A (nipple - machined, formed, moulded), Type B (stand pipe with ring seals) and Type C (quick connector coupling / male tube end).
• Dimensions & tolerances: Nominal diameters, lengths and tolerance data are provided in tables (Tables 1, 3, 4, 5) to ensure interchangeability between mating hoses, connectors and couplings.
• Surface quality: Outside surface roughness limits and permitted imperfections are specified; surface texture is measured per ISO 4288.
• Radii and geometric features: Minimum/nominal radii and location of fillets for nipples are listed to avoid seal damage and ensure reliable assembly.
• Material and construction notes: Different manufacturing methods (machining, forming, moulding) and optional identification marks (e.g., for full engagement on Type B) are covered.
• Designation rules: Standardized naming format (e.g., ISO 13948-2 - A.2.1 10,1) for unambiguous component identification.

Applications and who uses it

ISO 13948-2:2016 is intended for:

• Automotive OEMs and engine manufacturers specifying low-pressure fuel and return line connections for diesel engines.
• Component and hose suppliers designing push-on nipples, stand pipes and quick-connect tube ends to meet interoperability and leak-resistance requirements.
• Design engineers creating fuel system layouts where low-pressure connections must be reliable and serviceable.
• Test laboratories and quality control teams verifying dimensions, surface finish and fit per the standard.
• Aftermarket and maintenance operations ensuring replacement parts are compatible with original equipment.

Practical benefits include improved interchangeability, reduced leakage risk, simplified assembly and clear designation for procurement and service.

Related standards

• ISO 13948-1 - Threaded low-pressure connections (complements Part 2)
• ISO 4288 - Surface texture: profile method (normative reference for surface measurements)
• ISO 2974 and SAE J2044 - referenced for related high-pressure and quick-connector practices
• Other ISO fuel-filter standards listed in the standard’s bibliography

Keywords: ISO 13948-2:2016, diesel engines, push-on connections, low-pressure fuel connections, Type A nipple, Type B stand pipe, Type C quick connector, fuel injection connections.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 13948-2
Third edition
2016-12-15
Diesel engines — Fuel injection
pumps and fuel injector low-pressure
connections —
Part 2:
Non-threaded (push-on) connections
Moteurs diesels — Raccords basse pression pour pompes d’injection
de combustible et porte-injecteurs de combustible complets —
Partie 2: Raccords non filetés (à pression)
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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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CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Connection designs and applications . 1
4.1 Type A: nipple connection . 1
4.2 Type B: stand pipe connection . 2
4.3 Type C: “quick connector coupling” connection. 2
5 Dimensions and surface quality . 3
5.1 Type A connection ends . 3
5.1.1 Nipple types . 3
5.1.2 Basic dimensions and tolerances. 5
5.1.3 Radii . 6
5.1.4 Surface quality . 6
5.2 Type B connection end . 7
5.3 Type C connection end . 8
6 Designation .11
Bibliography .12
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
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committee has been established has the right to be represented on that committee. International
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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).
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constitute an endorsement.
For an explanation on 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 the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 34,
Propulsion, powertrain and powertrain fluids.
This third edition cancels and replaces the second edition (ISO 13948-2:2012), which has been
technically revised with the following changes:
— a normative reference has been made to ISO 4288 for the measurement of surface texture.
A list of all the parts in the ISO 13948 series can be found on the ISO website.
iv © ISO 2016 – All rights reserved

Introduction
It is recognized that a large variety of low-pressure connections exist on fuel injection equipment,
using different sealing principles, as well as designs. This document attempts to provide the user with a
common set of preferred types.
This document is divided into two parts, covering threaded connections (ISO 13948-1) and non-
threaded (push-on) connections (ISO 13948-2) for use with low-pressure fuel supply and return, boost
air pressure and lubricating oil supply and return.
INTERNATIONAL STANDARD ISO 13948-2:2016(E)
Diesel engines — Fuel injection pumps and fuel injector
low-pressure connections —
Part 2:
Non-threaded (push-on) connections
1 Scope
This document specifies requirements for the connection ends of push-on connections used with fuel
injection equipment.
Three types of push-on connections (types A, B and C) are described in this document.
NOTE Low-pressure connections to fuel filters are covered in other International Standards; see the
bibliography. High-pressure end-connections for pumps and injectors are covered in ISO 2974 and ISO 13296.
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 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and
procedures for the assessment of surface texture.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7876 (all parts) apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Connection designs and applications
4.1 Type A: nipple connection
EXAMPLE See Figure 1.
This design is intended for use directly with the mating hose (2) or in conjunction with a retaining clip
around the hose (not shown) for a more secure connection.
The nipple (1) can be machined (see Figure 4), formed (see Figure 5 and Figure 6) or moulded (see
Figure 7).
Key
1 nipple
2 hose
Figure 1 — Type A connection (principle)
4.2 Type B: stand pipe connection
EXAMPLE See Figure 2.
This design is used in conjunction with proprietary push-on connections (3) attached to the mating
hose (2) that seals by compressing rin
...