Proposal to introduce improvements and amendments concerning the evaporative emission family definitions and the Type 4 test procedures with regard to test equipment requirements and calibrations, evaporative emission measurement enclosures, and use of variable volume SHED facilities

Amendments to the global technical regulation on evaporative emissions to address:

1. Calibration requirements and intervals for test equipment;
2. Equation for the variable-volume enclosures;
3. Improvements to the text:
   1. Clarification of aged carbon canister and when to install;
   2. Clarification and review of test equipment;
   3. Clarification and review of requirements of an evaporative emission family;
   4. Clarification of “carbon canister”;
   5. Change to the term “carbon canister” used to catch depressurisation puff loss overflow.