I am having a problem that I am sure has been covered before, but here goes. I have an 02 2500HD. 86000 miles. Have never had a problem until now. Last weekend the temps in Minnesota were topping out around -10F. The truck had not been started for about 2 weeks. I plugged it in for around 3 hours and it started. Started hard but started. I ran it for about and hour and a half running errands ending up out at my ice shante. I turned the vehicle off and three hours later tried to start it. It would crank but not even a pop. I left it unitl the next day. Next morning I drove out and plugged the block heater into a generator for 4 hours. Same result, turned over but no fire, so I towed it to a friends cabin. Now, a little background. When I started the truck on my way to the lake I had about 1/4 tank of fuel purchased in late December. On my way I stopped and added approx 12 gallons of fresh fuel. In hind sight, the Diesel at this station was $0.10 cheaper than any other store passed on the way?????? Bad fuel??? I believe that I have a gelled fuel system. Today temps reached 5 ABOVE zero. I tried again with no results, though the truck was not plugged in. I put a battery charger on it for 5 hours and it is currently plugged in overnight. I added some fuel anti-gel to the tankand will try again tomorrow as the high is supposed to reach double digits above zero. My question is do I have a chance of getting this thing started if it is gelled without a warmed shop, in the temps I am describing? It is supposed to hit 20 by the wknd? Do my odds greatly increase or am I being overly optomistic. Last question, I have heard about filters "waxing". Does the filter need to be changed or will it just plug again? Any insight would help as it is about 30 miles from a garage and I want to exhaust all options before I pay the towing bill. Thanks in advance.