so yesterday morning i was sitting at a stop like and my truck quit just like i turned the key off. i tried cranking it but it would not restart. the temperature was in the single digits so i added some diesel 911 to my fuel filter with no change. tried starting fluid ( with glow plugs turned off ) that was no help. after all this cranking i checked my high pressure oil reservoir and found it low so i refilled it but still would not start. got it towed to our shop and hooked up a gauge to the high pressure oil rail and that was reading fine. hooked up a fuel gauge and at first it read kinda low but as i cranked it more it gradually came up to about 60 or 70 psi. then i noticed smoke coming out the tail pipe so i turned my glow plugs back on and then it fired right up and have not had a problem since. i kinda wanna think that maybe my cam sensor was acting up but not real sure. i changed it out today and drove a short distance with no problems. not the first time this year it's been that cold and never had a problem with fuel yet. last time my cam sensor went bad was a couple years ago but it acted the same way in that went to start my truck and it wouldn't fire, it finally did and then shut-off again after driving about 10 foot or so. did this two or three times till i finally got it driven into shop. replaced it and didn't have a problem for three or four years till yesterday. both yesterday and the previous time i had a tachometer reading while cranking with no start. thank-you in advance for any help.