- Compressed air through vent, reinstalled.
- Fill plug still popped out.
- Cleaned vent with spray carb cleaner, then a can of spray brake cleaner.
- Next, re-installed vent cap.
- Fill plug stayed in!
2014 EX sedan 1.8 CVT
Has nothing to do with a filter loaded with contaminants.I wonder if the plug is popping out because the filter is clogged and bypassing.