Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:3:p9
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 3 (pt 9/18)
Character Range: 321017–323853

and opened, and the vehicle fuel tank cap(s) removed. If break-through has not occurred by the time the fuel temperature 308 K (35 C), the heat source is removed from the vehicle, the vehicle removed from the evaporative emission enclosure and the entire procedure outlined in paragraph 5.1.7. below repeated until break-through occurs.

          5.1.6. Butane loading to breakthrough

          5.1.6.1.  If the enclosure is used for the determination of the break-through (see paragraph 5.1.4.2. above) the vehicle shall be placed, with the engine shut off, in the evaporative emission enclosure.

          5.1.6.2. The evaporative emission canister shall be prepared for the canister loading operation. The canister shall not be removed from the vehicle, unless access to it in its normal location is so restricted that loading can only reasonably be accomplished by removing the canister from the vehicle. Special care shall be taken during this step to avoid damage to the components and the integrity of the fuel system.

          5.1.6.3. The canister is loaded with a mixture composed of 50 per cent butane and 50 per cent nitrogen by volume at a rate of 40 grams butane per hour.

          5.1.6.4. As soon as the canister reaches breakthrough, the vapour source shall be shut off.

          5.1.6.5. The evaporative emission canister shall then be reconnected and the vehicle restored to its normal operating condition.

          5.1.7.  Fuel drain and refill

          5.1.7.1. The fuel tank(s) of the vehicle(s) is (are) emptied using the fuel tank drain(s). This shall be done so as not to abnormally purge or abnormally load the evaporative control devices fitted to the vehicle. Removal of the fuel cap is normally sufficient to achieve this.

          5.1.7.2. The fuel tank(s) is (are) refilled with test fuel at a temperature of between
          291  8 K (18  8 C) to 40 + 2 per cent of the tank's normal volumetric capacity. The fuel cap(s) of the vehicle shall be fitted at this point.

          5.2. Preconditioning drive

          5.2.1. Within one hour from the completing of canister loading in accordance with paragraphs 5.1.5. or 5.1.6. the vehicle is placed on the chassis dynamometer and driven through one Part One and two Part Two driving cycles of Type I test as specified in Annex 4. Exhaust emissions are not sampled during this operation.

          5.3. Soak

          5.3.1. Within five minutes of completing the preconditioning operation specified in paragraph 5.2.1. above the engine bonnet shall be completely closed and the vehicle driven off the chassis dynamometer and parked in the soak area. The vehicle is parked for a minimum of 12 hours and a maximum of 36 hours. The engine oil and coolant temperatures shall have reached the temperature of the area or within  3 K of it