I have a JD L110 that initially had a 17.5 single and years ago replaced with an 18 V twin....I say this because were it a single it probably would die but being a twin, it would hit and miss, assuming one cylinder or the other was cutting out.
The tank is visible through a cutout in the sheet metal under the seat. One day I noticed the tank had disappeared!!!!!! Ok, in short, the little hole in the top of the vent cap had become plugged with debris and the tank was able to develop a vacuum which sucked the tank into a wad. Amazingly I was able to get it back into original condition, reinstalled it and cleaned the hole out in the process.
Fast forward....I removed the mower deck and installed a basket over the hood, put studded snow tires on it for muddy condition traction, plus running low air pressure for a soft ride....it's my JD Gator.....ette. Anyway, I didn't use it for a few days during our "deep freeze". Yesterday I had it back out and it started intermittently misfiring. Mentally backtracking it's fuel and maintenance history, nothing made sense as to the cause. I was sitting on top of it pondering the question and the thought came to me.....you don't think the fuel tank cap vent is plugged again....Looked down at the fuel tank window and it was half full.....hopped off, lifted the seat, unscrewed the cap and in a couple of seconds it ran like it normally does. Utterly amazing!
Cleaned out the hole again and reinstalled...good as new. When something quits running right, you just never know where you will find the cause and never having a fuel tank vent to clog in 43 years of trying to learn how to farm with all the fuel driven machinery used in that process, and to have this one clogs twice in about 1500 hours of operation, is mighty peculiar if you ask me.......but it's something you seldom think about.