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AS/NZS 1425:2013


LP Gas fuel systems for vehicle engines

This Standard specifies requirements for liquefied petroleum gas (LP Gas) fuel systems for engines mounted on motor vehicles, either for the propulsion of the vehicles or for driving some auxiliary function, for example a mixer or a pump. It provides requirements for the design and construction of component parts and for their installation in vehicles, and for tests, commissioning and periodic inspection.
Published: 04/10/2013
Pages: 66
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Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope and application
1.1.1 Scope
1.1.2 Application
1.2 Referenced documents
1.3 New designs and innovations
1.4 Definitions
1.5 Vehicle modifications
1.6 Minor alterations
1.7 Engine management system
1.8 Performance requirements
1.9 LP Gas equipment and components
1.10 Certified kit
1.11 Previously used equipment
1.12 LP Gas withdrawal from automotive systems
1.13 Decommissioning of LP Gas fuel system
1.14 Working area and safe practices
1.15 Regulatory agencies
2 Components
2.1 General suitability
2.1.1 General
2.1.2 Suitability for pressure
2.2 Suitability for installation
2.3 Modification
2.4 Metals
2.5 Non-metals
3 Container sub-assembly
3.1 Application
3.2 Container
3.2.1 General
3.2.2 Use of removable containers
3.3 Components for fixed containers
3.4 Components for removable containers
3.5 Component suitability
3.6 Filling connection
3.7 Filler non-return valve system
3.7.1 Direct filling system
3.7.2 Remote filling system Filling connection Fill line
3.7.3 Internal non-return valve
3.7.4 Filler cap
3.7.5 Filling point location
3.8 Automatic fill limiter (AFL)
3.8.1 Design
3.8.2 Performance
3.8.3 Durability
3.9 Fixed liquid level gauge
3.10 Contents gauge
3.11 Excess-flow valve
3.12 Service valve
3.13 Automatic fuel shut-off device at container
3.14 Fuel filter
3.15 Safety valve
3.15.1 General
3.15.2 Safety valve discharge
3.16 Location of container components
3.17 Compartments and sub-compartments
3.17.1 Internal containers
3.17.2 Construction
3.17.3 Ventilation
3.17.4 Conduits and ducts
3.18 Mounting of fuel container
3.18.1 Correct orientation
3.18.2 Access to valves
3.18.3 Attachment to vehicle
3.18.4 Multiple containers
3.19 Container location, ground clearances
3.20 Protection
3.21 Heat shielding
3.22 Electrical connections in the sub-compartment
4 Fuel lines
4.1 Application
4.2 Rigid piping
4.2.1 General
4.2.2 Suitability of rigid piping
4.3 Flexible piping (hose and hose assembly)
4.4 Joints and connections
4.5 Installation and protection
4.6 Piping or fittings in enclosed spaces
4.7 Multiple container installations
4.8 Hydrostatic-relief valve
4.9 Trailers and semitrailers
4.10 Previously used equipment
4.11 LP Gas fuel piping for pressure not exceeding 7 kPa
4.12 LP Gas fuel piping for pressure not exceeding 450 kPa
5 Fuel control equipment
5.1 Application
5.2 Fuel pumps
5.3 Fuel filter
5.4 Automatic fuel shut-off device in engine bay
5.5 Vaporizer
5.6 Regulator
5.7 Installation of vaporizer and regulator
5.8 LP Gas fuel injector or other gas metering device
5.9 Gas-air mixer
5.10 Fuel selector
5.10.1 General
5.10.2 Optional fuel type
5.10.3 Bypass relief device
5.10.4 Fuel selection control
5.11 Petrol system modifications
5.12 Electrical wiring
5.13 Engine management system
6 Inspection testing and commissioning
6.1 Application
6.2 Used equipment
6.3 Modifications and repairs
6.4 Precautions
6.5 Inspection
6.6 Leak detection
6.7 Container sub-assembly leak test
6.7.1 General
6.7.2 Leak test
6.8 Installation test
6.8.1 General
6.8.2 Gastightness of compartments and sub-compartments
6.8.3 Leak testing of gas system
6.8.4 Test of automatic fill limiter
6.8.5 Test of fuel control device
6.8.6 Coolant system tests
6.8.7 Visual inspection
6.9 Periodic inspection
6.9.1 General
6.9.2 System check
6.10 Excess-flow valve test
6.11 Non-return valve test
6.12 Automatic fill limiter test
6.13 Testing of automatic fuel shut-off device
7 Certification, compliance plate, markings and labels
7.1 Application
7.2 Certification
7.3 Compliance plate
7.4 Labels and markings
7.4.1 Outlet markings All containers Multiple containers
7.4.2 Vehicle identification
7.4.3 Controls
7.4.4 Access hatch
7.5 Operating instructions
Appendix A
Appendix B
Appendix C
C1 Scope
C2 Combustible-gas detector
C3 Trace-gas detectors
C4 Foaming agents
C5 Total immersion
C6 Visual inspection
Appendix D
D1 Scope and vehicle selection
D1.1 Scope
D1.2 Use of certified kits on engine/vehicle variants
D1.2.1 Light vehicles
D1.2.2 Heavy vehicles
D2 ADR 79/00 vehicles
D2.1 General requirements
D2.2 Testing requirements
D2.2.1 General
D2.2.2 IM240 test procedure for bi-fuel vehicles (part time petrol or LP Gas)
D2.2.3 IM240 test procedure for mono-fuel vehicles (permanent LP Gas)
D2.2.4 Dual-fuel diesel vehicles (part diesel and part LP Gas)
D2.3 Documentation and installation requirements
D3 ADR 79/01 vehicles
D3.1 General requirements
D3.2 Testing requirements
D3.2.1 General
D3.2.2 IM240 test for bi-fuel vehicles (part time petrol or LP Gas)
D3.2.3 IM240 test procedure for mono-fuel vehicles (permanent LP Gas)
D3.2.4 Dual-fuel diesel vehicles (part diesel and part LP Gas)
D3.3 Documentation and installation requirements
D4 ADR 70/00 vehicles
D4.1 General requirements
D4.2 Testing requirements
D4.2.1 DT80 method
D4.2.2 CUEDC method
D4.2.3 ADR 70 method
D4.3 Documentation and installation requirements
D4.3.1 DT80 method
D4.3.2 CUEDC method
D4.3.3 ADR 70 method
D5 ADR 80/00, ADR 80/01 ADR 80/02 and ADR 80/03 vehicles
D5.1 General requirements
D5.2 Testing requirements
D5.3 Documentation and installation requirements
D6 ADR 79/02 vehicles
D6.1 General requirements
D6.2 Testing requirements
D6.3 Documentation and installation requirements
D7 ADR 79/03 vehicles
D7.1 General requirements
D7.2 Testing requirements
D7.2.1 IM240 test for bi-fuel vehicles (part time petrol or LP Gas)
D7.2.2 IM240 test procedure for mono-fuel vehicles (permanent LP Gas)
D7.2.3 Dual-fuel diesel vehicles (part diesel and part LP Gas)
D7.3 Documentation and installation requirements
Appendix E
E1 Scope
E2 Introduction
E3 Principle
E4 Apparatus
E5 Detailed test requirements
E6 Recording of results and reporting of the test results
E7 Pass/fail of the test
Cited references in this standard
Working areas for gas-fuelled vehicles
Fuel and oil hoses
Pressure vessels
Safety valves, other valves, liquid level gauges and other fittings for boilers and unfired pressure vessels
Copper tubes for plumbing, gasfitting and drainage applications
Content history
DR2 AS/NZS 1425