I'm still having issues starting cold with my truck. I was a bit surprised- it sits for about a week at a time and last weekend it started on the 2nd try. This morning it wasn't wanting to start (it was about 35 deg out). I went down again around mid day (temps in the 50s) and after opening the drain valve on the fuel filter was able to get it started. I did hear air gurgling when I unscrewed the valve. There's a line that was uncapped below the filter. After finally getting my hands on the diesel owner's manual, I now realize that someone changed out the OEM filter. I guess the original one had a screw on cap and some sort of drain line? When I got the truck it has an aftermarket style fuel filter with the petcock so that's what I replaced it with when I did the injector service. I capped off that line today. I'm wondering if that's one usually does if the truck doesn't the original style fuel filters? Is there anything else I should look at?