I sure hope your issue isn't what happened to me, I buy my fuel in 20 litre containers which allow me to keep 8 containers in reserve and my tank of 200 litres full, I have been doing this for more years than I like to remember, and that was my mistake number 1, I lost track of fuel that was purchased in summer and by chance one cold day, around -20 degrees C or -4 degrees F I started my tractor and began to back out of my garage (not heated) and the tractor just stopped running right under the O/H door, I had been using a block heater and a magnetic oil pan heater, so after a while I tried to start again and when it started I drove back in the garage, I reved up the engine to 1500 rpm and within 30 seconds the tractor stopped again, thinking it was a frozen fuel line I put some Isopropyl alcohol in the fuel, mistake number 2, waiting most of the day for the alcohol to melt ice in the fuel got me no where, next day I went to a diesel repair shop and asked for de-icer for my fuel, the mechanic asked a few questions and told me the alcohol was the worst thing I could have done, he said alcohol separates the wax in the fuel and clogs the filter and strainer on the fuel line, He recommended a product they use, Howes diesel conditioner, as he said it does not thaw ice but it simply keeps the fuel from gelling, he recommended about a quart for my 200 litre tank which was full. So home I went and poured in about half the 2 litre can of conditioner, I waited about 5 hours and tried the tractor, same result, it would start and run about 30 seconds then stop, hoping time would get the anti gelling fluid to work I tried this for a few hours, still the same. I knew my only alternative was to drain the tank and add new winter fuel, but taking 200 litres out of a tractor tank in not easy or fast, but it seemed like I had no choice, my next test was to remove the filter and strainer to see what was there, not having a replacement for the strainer I had to drive a 100 k (60 miles) to purchase from my Kubota dealer, which I did the next day, in the mean time I had to find a drum to hold the fuel, 200 litres, and a pump, which I never was able to find, so actually siphoned the fuel into 20 litre cans and dumped them into the clean drum my son got for me, before I drained the tank or filter and strainer I disassembled them to check what I could find, when I removed the filter it seemed clean but the strainer, which has a clear plastic bowl and I thought it seemed quite bright white, when disablement the white was an almost solid junk of was, almost as if you had melted a candle in it, I cleaned it with the Howes diesel conditioner and reassembled it, after priming, which on this tractor is a starter function, explained in the manual, it started and after sputtering revved up but within 30 sec or so it stopped, checking the strainer I could see the white wax was back filling it, I repeated the cleaning and starting several times only to realize that the problem was a tank full of fuel with the wax in suspension and the only solution was to drain the tank and add new winter fuel, this reminds me that I still have to replace the strainer screen, it is a tube like screen made of brass and has almost completely collapsed due to the pressure of trying to force fuel and wax through it, when I went to my dealer I got a two new filters and what I thought was a spare screen strainer, I have been only cleaning the old one since I didn't have a spare on hand, this little screed cost $40.00, but it must be worth in, I must remember to put the new one in my tractor and keep the old one for a spare, I am afraid the old one was too deformed and may have small cracks, or part of the screen may actually let go and get into my injectors, to finish my story, it took me til 9:00pm and again about 4 more hours the next day siphoning the fuel from the tractor, then I had to buy more cans simply to transfer from the tractor to the drum, later make two trips to buy diesel fuel, I didn't have enough empty cans to fill it in one trip and I didn't want to take a chance driving the tractor to the fuel station, I didn't know if I could trust it, but since I have changed fuel, and cleaned the strainer everything seems to run fine, but as a precaution I must install the new strainer, just to be on the safe side. As I write this we are having a major winter blizzard, very high winds, snowing so hard I can't hardly see my garage, think I'll change the strainer before I start clearing snow with my blower, yesterday I got a call from my son, he was feeding hay in the pasture with his tractor using a spear, as he tried to maneuver to place the bale in the holder he upset his tractor, we worked for
hours and could not right the tractor, today we got a huge loader that was able to right it, now he has to wait a day before trying to start it. Never a dull moment, but he didn't get hurt, Thank God.
Hope I didn't discourage you, if you have questions I will try to help if I can.
God bless
Jim
