Originally Posted by vasinvictor

Get a fuel pressure tester that has a banjo bolt adapter in it. You can hook it in where you did the "fuel line flip". You may be able to connect it to the front side of the rail too, it may be easier to get at. Your fuel pump should activate when you actually crank the truck, or it might come on in IG2, depending on how you wired your COR. Factory way fuel pump comes on when the truck is actually cranking. You can use the Diagnosis pins under the hood to jumper your fuel pump on (FP and e1, I believe). If you get fuel pressure that way, then have a buddy help you crank the truck while your testing and see if you get pressure. This will tell you if the COR is wired correctly.

I mean the 3.0 was running before you yanked it, so I'm doubting fuel pump problem. Gonna be a wiring issue. Can you spray ether down the throttle body while cranking and see if you get fire? Be careful with that stuff though, spray while cranking, don't spray a pool of it then try to crank.