Ok, I got it working.

I primed it with the primer pump, about 10 times, then tried to crank it. Nothing. Primed it another 10 times, and then tried to crank it, but this time I floored the gas pedal and I just kept it cranking and after about a minute it finally fired. Thanks for helping me out guys. I had no idea something like this happens when you run out of diesel, nor that you could crank it for that long without anything going wrong. On a gas car, the battery would've drained a long time ago, trying to crank it that many times and for that long. After I got it started, I guess there was so much fuel in the engine, that for about a mile, whenever I stepped on the gas white smoke would come out of the back.

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Gabriel
'91 350SD 162k
'83 300SD 210k - rear-ended and scrapped
'84 300SD 210k - totalled