Yeah, I'm not worried about when the truck is sitting, I'm more concerned about with highway driving in extreme cold.
The guy at the dealership said my mass air flow sensor probably froze up and that's what caused my truck to stall. It was -25F and I was driving 70mph into wind... He said that probably did it, and I didn't have a winter front on... Hindsight is 20/20 :argh:

I don't understand how you gelled your fuel in Texas? This 'global warming' :moon: must be worse than I thought! . . . . LOL

Seriously, I made my winter front for free.... It is out of a plastic bag. Goes on and comes right back off in about as long as it takes to read this sentence.... (I'll gladly post pics / design ideas if you want!) (Oh course, now I see that you have one of those 'other' brands . . . . It still might give you an idea. I'd gladly try to help if you want!)

I don't understand their reason for not installing that heater for you. What would be wrong with the coolant heating your fuel? Only problem I could see is if it does get it too hot. Our transmission coolers have a thermostatic valve on them so they don't cool too much during the winter; so why would it be that hard to keep the fuel from getting too hot?

Driving in -25F would be enough to gel your fuel I would think! I have never experienced it and I hope to avoid it! I added a 2 micron fuel filter back by the tank. I had worried about it for a few winters, but driving in as low as -10F didn't cause any troubles so far. But I do know of one difference between our trucks: Doesn't yours have a fuel 'cooler' just in front of the fuel tank (If it is still there after your fuel tank upgrade)? I wonder if that is thermostatically controlled to not cool the fuel in the winter? If that were to malfunction in such low temps . . . . :argh:
Along this line, I would assume your truck has a heated OEM filter. That could have also stopped working and caused this problem.
I had opportunity last winter to pour diesel from a 5 gal can into a gallon container. It was around -5F out and I could not believe how thick that fuel was. Reminded me of syrup or something thick like that . . . . I can now understand what causes it to stop flowing in a filter. Especially if there is any moisture at all to freeze and help the paraffin crystals to form a 'plug'! My bro gelled up a few of winters ago. He had just asked himself: "Why are all these 'new' Duramax and PowerStrokes setting beside the freeway" when his started slowing down and loosing power. He started to wonder if he was going to get home that night when it sat inside the heated shop all day and still didn't start until about 3:30PM.

Yeah, gelling should just be out-lawed!! :tttt:

Sorry,to hear that. Install of an Espar or Webasto coolant heater is pretty simple, but time consuming, if you want a neat install. I did it twice and it is pretty forward to do.
You don't have to worry about heating up fuel lines- fuel heaters shut off at 80°C and cycle back on at 71°C . Self ignition temperature of Diesel is 120°C. At least you have a 40°C safety margin.

It's done here very often and much better than a block heater.
Michael