# Commission Regulation (EU) No 582/2011 of 25 May 2011 implementing and amending Regulation (EC) No 595/2009 of the European Parliament and of the Council with respect to emissions from heavy duty vehicles (Euro VI) and amending Annexes I and III to Directive 2007/46/EC of the European Parliament and of the Council (Text with EEA relevance), Division 4.3.3: Provision shall be made to prevent excess evaporative emissions and fuel spillage caused by a missing fuel filler cap. This may be achieved by using one of the following:

Extent: E+W+S+N.I.

(a)an automatically opening and closing, non-removable fuel filler cap;
(b)design features which avoid excess evaporative emissions in the case of a missing fuel filler cap;
(c)or in case of M1 or N1 vehicles, any other provision which has the same affect. Examples may include, but are not limited to, a tethered filler cap, a chained filler cap or one utilising the same locking key for the filler cap as for the vehicle’s ignition. In this case the key shall be removable from the filler cap only in the locked condition.

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Source: https://www.legislation.gov.uk/eur/2011/582/annex/I/division/4/division/4.3/division/4.3.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-582/annex-I/division-4/division-4.3/division-4.3.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.