Thanks to all, regarding gelled fuel filter. Had bought diesel, months ago, in warm weather. I've always added a bit of "additive"to keep the diesel de-gelled, but skipped it last fill up of my reserves. Although I had to replace the battery the other day, and was able to run the 4115 long enough to blow the driveway snow, at -18 this morning, I could start, but not keep it running. 1st thought should have been the fuel filter, but I apparently had brain-freeze. Wish I had a spare filter. Thought I had, but no, and this one is full of gel. From now on I'll make sure I have extras. Best I can do, for now, is clean this one out and hope that the de-geling additive I've added, along with slightly warmer weather (i.e. up to a whopping +9 degrees) will prevent it from clogging up again until I can replace the diesel and get a new filter. Don't I feel foolish for not having thought of the filter 1st. Again, thanks all...