It looks like the orginal charcoal vents outside the filler neck. Pulling it apart it gives me a good idea of building a small enclosure to keep the filter out of elements.
It sounds like everyone is having issues with keeping the filter clean and working all of the time due to the fact that its now more exposed to the elements and not closed off envoirnment. I looked at the original design of the filler neck and see that the Vapor canister filter was directed...
@TeCKis300 For those who are installing a 40gal LRA tank I can confirm that these pads DO NOT need to be cut off. I don't know if that is because of an updated tank design or if the 40gal tank has always been sloped right there to completely miss those brackets. Just thought I would throw is...