Fuel lines must meet the following requirements:
- The material used for fuel lines must be a suitable grade for use with automotive fuels.
- Fuel lines must be securely fastened and must not leak.
- Push-on type hose connections must be fitted with hose clamps or clips.
- Fuel lines must be clear of the exhaust system and any turbocharger.
- Where fuel lines pass through panels, bulkheads or the chassis they must be adequately supported and protected from chafing or damage.
- When fitted under a vehicle, fuel lines must be protected from road debris and damage either by chassis or body components by shielding.
Fuel filters and pumps
Additional fuel filters and alternative or replacement fuel pumps may be fitted provided that:
- the installation is in accordance with good engineering practice
- no pump, fuel line or filter is located within the occupant compartment or boot
- all components are unmodified
- the fuel pump stops when the ignition is in the off position
- the alternative/replacement fuel filter or fuel pump is secured, and shielded against heat and damage
- and that there are no leaks.
LP gas or petrol and LP gas
Vehicles that are equipped to operate on dual fuel - eg the vehicle can operate on either petrol or liquefied petroleum gas (LPG) - must retain all original emission control equipment, except for the air cleaner, carburettor, heated inlet air and associated equipment. These may require modifications to facilitate the installation of the LPG intake system.
The vehicle must also comply with the petrol related regulations. Any emission control systems that were fitted eg catalytic convertors and oxygen sensors - must remain operational.
Conversion of a vehicle to operate on LPG must be performed to AS/NZS 1425 - LP Gas Fuel Systems for Vehicle Engines.
Only a licensed person is allowed to install or repair LPG equipment. A current identification plate must be fitted to certify that the LPG system meets the requirements of AS/NZS 1425.
Dedicated (single) fuel
Vehicles that are not required to comply with Australian Design Rule (ADR) 37 (pre 1 February 1986), and which are running solely on LPG, need not be fitted with emission control equipment, provided that the following requirements are met:
- The vehicle exhaust emits less than 4.5% carbon monoxide at recommended engine idle speed.
- The petrol pump, fuel tank, carburettor, fuel supply lines and any other associated equipment related to the petrol fuel system is removed from the vehicle.
- Vehicles built to comply with ADR 37 and later, must retain all emission control equipment including the catalytic converter.
- From 13 December 1993, vehicles originally designed to operate with a closed loop engine management system must have an LPG closed loop management system installed which results in exhaust emission levels for LPG operation that are not inferior to the levels produced by the original vehicle prior to LP gas fitting.
Replacement fuel tanks
Fitting replacement or additional fuel (petrol) tanks to vehicles manufactured prior July 1976 does not contravene the requirements of Road Traffic Act and Regulations, provided that sufficient ground clearance is retained and they are fitted outside the passenger compartment.
For vehicles manufactured on or after 1st July 1976 the ADR requirements for evaporative emission controls must be met, including:
- All fittings and devices fitted to the fuel tank by the vehicle manufacturer must be retained or duplicated and operate correctly.
- The fuel tank and filler shall be arranged so that any overflow or leakage of fuel cannot accumulate or contact the exhaust or electrical systems.
- Fuel tanks fitted to the vehicle are normally required to be filled and vented externally.
- If a filler inlet is located inside a vehicle, it must not be inside the passenger compartment and the inlet must be separately sealed from the rest of the vehicle to ensure fumes or spilled fuel cannot enter the passenger cabin.
- There must be no lights or electrical wiring in the area where the fuel filler is located.
- The minimum ground clearance of 100mm must be retained.