Fuel gauge is probably lying to you, and it ran out of diesel. Only one way to find out is switch tanks or fill the passenger side (23 gal capacity). To boot, fastest way of priming is after you got at least half a tank is use shop air to re-prime the system don't go more than 10 lbs.
Is there a square filter on the firewall or is there a round one?
One more thing you can check, on top of the engine toward the front, there will be two diff colored wires (single red, and a double green). Turn the key on, then make sure both got power. If the red wire does, but the green one doesn't, run a jumper to it (make sure to listen for a click). That terminal is for the return line solenoid. If it doesn't work, the engine will not run good, or at all.
Last edited by wildbill; 08-24-2011 at 08:16 PM.