Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:3:p7
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 3 (pt 7/18)
Character Range: 413313–416368

integrity of the fuel system.
5.1.3.2. The weight of the canister shall be checked.
              5.1.3.3. The canister is connected to a fuel tank, possibly an external one, filled with reference fuel, to 40 per cent volume of the fuel tank(s).
              5.1.3.4. The fuel temperature in the fuel tank shall be between 183 K and 287 K (10 and 14 °C).
              5.1.3.5. The (external) fuel tank is heated from 288 K to 318 K (15 to 45 °C) (1 °C increase every 9 minutes).
              5.1.3.6. If the canister reaches breakthrough before the temperature reaches 318 K (45 °C), the heat source shall be turned off. Then the canister is weighed. If the canister did not reach breakthrough during the heating to 318 K (45 °C), the procedure from paragraph 5.1.3.3. above shall be repeated until breakthrough occurs.
              5.1.3.7. Breakthrough may be checked as described in paragraphs 5.1.5. and 5.1.6. of this annex, or with the use of another sampling and analytical arrangement capable of detecting the emission of hydrocarbons from the canister at breakthrough.
              5.1.3.8. The canister shall be purged with 25 5 litres per minute with the emission laboratory air until 300 bed volume exchanges are reached.
5.1.3.9. The weight of the canister shall be checked.
              5.1.3.10. The steps of the procedure in paragraphs 5.1.3.4. to 5.1.3.9. shall be repeated nine times. The test may be terminated prior to that, after not less than three ageing cycles, if the weight of the canister after the last cycles has stabilised.
              5.1.3.11. The evaporative emission canister is reconnected and the vehicle restored to its normal operating condition.
              5.1.4. One of the methods specified in paragraphs 5.1.5. and 5.1.6. shall be used to precondition the evaporative canister. For vehicles with multiple canisters, each canister shall be preconditioned separately.
              5.1.4.1. Canister emissions are measured to determine breakthrough.
               Breakthrough is here defined as the point at which the cumulative quantity of hydrocarbons emitted is equal to 2 grams.
              5.1.4.2. Breakthrough may be verified using the evaporative emission enclosure as described in paragraphs 5.1.5. and 5.1.6. respectively. Alternatively, breakthrough may be determined using an auxiliary evaporative canister connected downstream of the vehicle's canister. The auxiliary canister shall be well purged with dry air prior to loading.
              5.1.4.3. The measuring chamber shall be purged for several minutes immediately before the test until a stable background is obtained. The chamber air mixing fan(s) shall be switched on at this time.
               The hydrocarbon analyser shall be zeroed and spanned immediately before the test.
              5.1.5. Canister loading with repeated heat builds to breakthrough
              5.1.5.1. 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