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.