At what temperature does fuel start to gel?

Do not run straight kerosene. Kerosene lowers cetane and may eat away at lines/seals at a high concentration.

 

10f is when I start running power service. Otherwise if there is any water in the fuel it will start gathering in your fuel filters in the form of ice, way before you have to worry about the fuel gelling. #1 in the refer.

 

I have a Davco heated fuel filter. I'm assuming that helps out a lot? Not sure.

 

Idling keeps the fuel flowing out and returning back to the tanks as fuel injection pumps more fuel to the engine than it can use so a portion of the system warmed fuel is always retuning to the tanks.

 

Cold started my truck every day last year in that bad winter weather, talking -30/-40 for a few weeks straight. Trucks sat out in the open lot, no protection from wind or elements.
She turned over, every time. Kinda hard on the starter, but a new starter and a late start to the day is cheaper than a heated shop in my old bosses eyes. That was with an old 3406, an '06 mp8 and a few older volvo engines. The 3406 surprisingly had the hardest time dealing with the cold, weird.

Have never had fuel gel on me, always keep the tanks a smidge over half so when I hit the colder latitudes I can get the fuel with preadded anti-gel.

Will occasionally let the truck idle on a cold night, but I keep it at a minimum.

 

This was exactly my concern. I wasn't sure that any of the truckstops in CO had gotten winterized fuel delivered and I had previously fueled in TX which isn't winterized and probably B10. I threw some Howes in and glad I did. I also idled in Cheyenne that night. Wednesday morning it got down to -21 in WY and although I put a little of the Howes in my reefer tank but it wouldn't fire up until I got down to Grand Junction where is was a lot warmer. I guess to answer the OP - when in doubt, spend the extra money for a bottle of additive and idle your truck.