The 2012s had a 10.5 litre tank that unfortunately swelled when exposed to some common tools, so if you removed it was nigh unto impossible to get back in the frame.
The fix was to retrofit the smaller tank (9.5 litre, and blown by a company that knew it would have fuel in it).
The access issue you're having is compounded by the plastic subframe, but most filter failures in 2012 were caused by battery acid leaking onto the filter.