Hi. We have a 2000 f-350 7.3 powerstroke. Approx. 3 wks ago, we were driving down the road, and it died, like you turned the key off. Wouldn't start. Had to have it towed home. Ever since then, I've been searching all the computer forums, looking for help to give my husband in diagnosing and fixing the truck. We had a spare motor, taken out of a wrecked truck, but it was running when it was wrecked. So he has taken out every sensor he can find on it, and replaced them into our truck. Still no start. The tach does move when you crank the truck, there is NO smoke out the tail pipe. The fuel pump is running. There is fuel in the fuel bowl. He replaced the HPOP. Still no start. Replaced the ECM under the wheel well with one bought from a salvage yard. I went to Oreilly to rent the code reader but they told me that if the check engine light is not on, then it won't work, and won't give any codes. Can someone please help ??? We live way out in the country, and tow bills and garage bills are extremely expensive. Theres usually nothing my husband cannot fix, but we are at our wits end on this. Any ideas would be greatly appreciated. Thanks.