Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p7
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 7/18)
Character Range: 210313–213357

with approval of the responsible authority, an alternative pressure can also be applied, taking into account the pressure range in use of the fuel system.

              3.3. The pressure shall be allowed to stabilise prior to isolating the fuel system from the pressure source.

              3.4. The venting outlets from the emission control systems to the atmosphere shall be reinstated to the production condition.

              3.5. The pressure of the fuel system shall drop to below a pressure less than 2.5 kPa above ambient pressure within one minute.

              3.6. At the request of the manufacturer and in agreement with the responsible authority the functional capacity for venting can be demonstrated, when applicable, by an equivalent alternative procedure.

              4. Purge test

              4.1. Equipment capable of detecting an airflow rate of 1.0 litres in one minute shall be attached to the purge inlet and a pressure vessel of sufficient size to have negligible effect on the purge system shall be connected via a switching valve to the purge inlet, or alternatively.

              4.2. The manufacturer may use a flow meter of his own choosing, if acceptable to the responsible authority.

              4.3. The vehicle shall be operated in such a manner that any design feature of the purge system that could restrict purge operation is detected and the circumstances noted.

              4.4. Whilst the engine is operating within the bounds noted in paragraph 4.3. of this appendix, the air flow shall be determined by either:

              4.4.1. The device indicated in paragraph 4.1. of this appendix being switched in. A pressure drop from atmospheric to a level indicating that a volume of 1.0 litre of air has flowed into the evaporative emission control system within one minute shall be observed; or

              4.4.2. If an alternative flow measuring device is used, a reading of no less than 1.0 litre per minute shall be detectable.

              4.4.3. At the request of the manufacturer and in agreement with the responsible authority an equivalent alternative purge test procedure can be used.

Appendix 5

Devices for monitoring on board the vehicle the consumption of fuel and/or electric energy
              Only applicable for Level 1A;

              1. Introduction

              This appendix sets out the definitions and requirements applicable to the devices for monitoring on board the vehicle the consumption of fuel and/or electric energy.

              2. Definitions

              2.1. "On-board Fuel and/or Energy Consumption Monitoring Device" ("OBFCM device") means any element of design, either software and/or hardware, which senses and uses vehicle, engine, fuel and/or electric energy parameters to determine and make available at least the information laid down in paragraph 3 of this appendix, and store the lifetime values on board the vehicle.

              2.2. "Lifetime" value of a certain quantity determined and stored at a time t shall be the