Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:9:p31
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 9 (pt 31/37)
Character Range: 1864358–1867448

outside of the enclosure to eliminate the possibility of the tank venting emissions being counted as permeation. The HC emissions shall be measured and the value shall be recorded in this case as HC20W.
              5.2.5. The PF is the difference between HC20W and HC3W in g/24h calculated to 3 significant digits using the following equation:

              5.2.6. If the PF is determined by a supplier, the vehicle manufacturer shall inform the responsible authority in advance of the determination to allow witness check in the supplier's facility.
              5.2.7. The manufacturer shall provide the responsible authority with a test report containing at least the following:
                  (a) A full description of the fuel tank system tested, including information on the type of tank tested, whether the tank is metal, monolayer non-metal or multilayer, and which types of materials are used for the tank and other parts of the fuel tank system;
                  (b) The weekly mean temperatures at which the ageing was performed;
                  (c) The HC measured at week 3 (HC3W);
                  (d) The HC measured at week 20 (HC20W);
                  (e) The resulting permeability factor (PF).
              5.2.8. As an alternative to paragraphs 5.2.1. to 5.2.7. inclusive of this annex, a manufacturer using multilayer tanks or metal tanks may choose to use an Assigned Permeability Factor (APF) instead of performing the complete measurement procedure mentioned above:
                 APF multilayer/metal tank = 120 mg /24 h
              Where the manufacturer chooses to use an APF, the manufacturer shall provide the responsible authority with a declaration in which the type of tank is clearly specified as well as a declaration of the type of materials used.
              6. Test procedure for the measurement of hot soak and diurnal losses
              6.1. Vehicle preparation
              The vehicle shall be prepared in accordance with paragraphs 6.1.1. and 6.1.2. of this annex. At the request of the manufacturer and with approval of the responsible authority, non-fuel background emission sources (e.g. paint, adhesives, plastics, fuel/vapour lines, tyres, and other rubber or polymer components) may be reduced to typical vehicle background levels before testing (e.g. baking of tyres at temperatures of 50 °C or higher for appropriate periods, baking of the vehicle, draining washer fluid).
              For a sealed fuel tank system, the vehicle carbon canisters shall be installed so that access to carbon canisters and connection/disconnection of carbon canisters can be done easily.
              6.1.1. The vehicle shall be mechanically prepared before the test as follows:
                  (a) The exhaust system of the vehicle shall not exhibit any leaks;
                  (b) The vehicle may be steam-cleaned before the test;
                  (c) In the case of use of the gasoline canister load option (paragraph 6.5.5.3. of this annex) the fuel tank of the vehicle shall be equipped with a temperature sensor to enable the