We had a extreme cold snap a few weeks ago. I went to start my BX With the temp. at about 22 degrees. The tractor started, ran normally for about 30 seconds, then started to jump and shake, terrible sounding. I shut her down then noticed the fuel tank cap was missing. The tractor had sat outside for a few days during which time it snowed. I waited for the weather to warm to the 50's to allow any water in the fuel system to unfreeze,drained the tank( It was almost empty), disconnected the fuel line at the engine turned on the tractor start switch to pump out any remaining fuel and refilled the tank with fresh diesel. I broke the line loose at the injectors and made sure I had fresh fuel to the injectors and tried to start the tractor using the normal cold weather starting procedure. The engine turns over normally, but there was not even a hint of the engine catching. I'm out of work and need to try to repair this myself. I a pretty good wrench on most things but I'm not very familiar with troubleshooting diesel engine problems. Would someone please help out with some suggestions on where to proceed from here. Thanks very much in advance for your assistance. Ric