As I was leaving my house tonight, I was smoothly accerating through 3rd gear and the truck just died on me. I checked the codes on the odometer and got P 1693 and that's all. I just replaced the injection pump about 2,000 miles ago. I've had a steady 15 PSI fuel pressure at the filter at idle and haven't seen it lower than 11. The truck has a torque dog on it so I tried unplugging it and the truck still won't start. It turns over but it just won't start. The lift pump still cycles and shows about 16 PSI. Any guesses?