I have had my little B7300 now for 22 years, and I have never had a fuel problem. I purchase off road diesel 15 gallons at a time from a local fuel dealer who delivers gas/diesel/kerosene/heating fuel to homes/farms/contractors/businesses. However, a neighbor had a small JD CUT that he constantly had fuel problems with. He never really talked about it much to me, but did complain to other people. After a few years, I began to ask around, and found what might have been his problem. It turned out that he was siphoning heating fuel from his home heating oil tank and used that for his tractor fuel. His reasoning was it was cheaper and was sold and delivered as 'dyed diesel fuel", (which they no longer do). I surmised that his home heating fuel tank had some really bad stuff going on inside, besides water, and that might have been his issue. As a side note, he has been buying his home heating fuel from the same dealer that I do for years,
I agree with storage issues mentioned earlier. Buying from reputable, high volume dealers will avoid a lot of problems down the road. I also think that buying in excess, if not justified, may also be asking for problems. Either on or off road diesel should not be an issue, if there is high turnover at the dealer.