i am going to assume that your filters are back by your fuel tank similar to my fass 95. i will tell you from experience at those temps it is easy to have gelling issues, even with a double dose of stanadyne. had it happen to me on thursday morning it was -4 all night. truck hacked and coughed all the way to work with no fuel pressure. funny thing is when i left work it had warmed up to the mid teens and within 5 minutes of running i had fuel pressure and it has been fine since. the easiest and quickest fix is to change out the filter. i have heard guys talk about wrapping the filters with something to try and keep them warmer, i have never tried it cause it might get cold enough one night a winter to cause me a problem. as for antigel treatments, i use them but often wonder, why a bottle of treatment will gel if left out in the cold.