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I searched the forums and found a few different possible answers but none that were a total fit. So here's the problem I ran into. I'm just going to mention something that happened last week because it may have to do with my current problem. Last week I ran the rear tank empty to the point of a misfire. I switched over to the front but it didn't change tanks (I had to flip the switch a few times before it switched tanks) But by that time I had sucked air in the fuel filter and had to prime it to restart her. My current problem happened this morning after work. I go to start my truck and it just turns over, no fire at all. It didn't even try and start. I checked to make sure there was fuel making it to the filter by draining the separator and it took a second or 2 for fuel to drain. So I hit the bleeder like I did when I ran her empty and it had some air in it but not a lot. Got in and she started right up I did notice it smoked quite a bit for about 20 or so seconds. It was only 42 degrees last night but had a cold N wind of about 15 mph blowing through the grill all night. I was thinking about maybe the fuel was beginning to gel but from everything I have read that diesel doesn't start to gel till around 10 degrees. Any ideas on what may be going on. Thanks in advance for any help.