Hey Turbs, what was the temp when your fuel gelled up? It has gotten down to 5 here and no issues with my Jeep. Does the Duramax have a fuel heater in the bowl? The original filter for my Jeep had a "puck" that had a heater where the filter screws on, and my aftermarket replacement has an element in the fuel bowl.
TV - 2015 Ram Truck EcoDiesel
TV - 2006 Jeep Liberty Turbo Diesel (Retired to Daily Driver)
TT - 2015 Rockwood Roo 183
Nights Camping --- 2015 - 19 Camped | Winterized -- 2014 -18
Come read my Camping Blogs