Correct as at 26th April 2024. It may be superseded at any time.
Extract taken: from Vehicle Inspection Portal > VIRMs > Alternative fuel system certification > CNG inspection > System gastightness
2-9 System gastightness
Reasons for rejection
Condition and performance
1. With maximum pressure in the system and all pipe connections and valves tested for leaks (with valves in both open and closed positions), a leak is indicated (Note 1).
Note 1
AS/NZS 2739: 2003, Appendix 2 describes leak detection methods.
Summary of legislation
Applicable legislation
- Land Transport Rule: Vehicle Standards Compliance 2002
- Land Transport Rule: Vehicle Equipment 2004
- AS/NZS 2739: 2003, section 6.9.
Condition and performance
1. Pipe and component connections must be gastight with manual valves in both open and closed positions.