Do you buy fuel from the same place? How often had you replaced fuel filters before you started having problems? The dealer says the filters fell apart in his mechanic's hands. I have seen some really dirty filters in past years but never have seen one that was close to falling apart..
I normally buy fuel at the same location - when possible.
Same fuel goes in my diesel pickup - so I am not really thinking it is a fuel quality issue, as my truck has not had any issues with the fuel.
As far as the fuel filter goes - book says every 100 hours - my hour meter was busted - I changed it annually, and with only 230 hrs on the tractor - more than the recommended interval.
I normally changed it around hunting season - so had not changed it in 2019 yet, but Nov/Dec 2018 it was changed.
I try to set stuff up for the winter like the mowers and tiller about that time each year...
It should be noted that I never had an issue with the tractor before the visit to the dealership - ran like a champ.
Well ok 1 issue - the primary hydraulic hose from the pump to the hydro pedal burst. That was in the first 50 hours or so - just a bad hose from the factory, replaced it and good to go for the next 3 years...