UPDATE: Well, the weekend was a learning experience. I replaced the o-ring at the connection of the high pressure line and the fuel rail and solved the leak, but that was not the problem. Turns out the alternator was only putting out 11.4 volts instead of 14.5, so the injectors were not firing, the battery wasn't charging and the coil wasn't getting enough juice. Found the only alternator available east of Houston and replaced it, along with the engine grounding strap that had corroded out. Now the truck runs like new.