Just to clean things up:
-Tach. bounces while cranking
-Fuel Pump (sounds like it's / buzzing) working
and all known sensors (CPS x2)
-checked and confirmed all (under the dash and under the hood) fuses good
-Wait to Start light cycles
PreachersWife, please check and confirm that I am correct with the list above.
Please confirm yourself or with your husband that:
1: when the truck cranked and started smoking that the smoke was White out the tail pipe
2: that the IPR (sensor on the HPOP) was changed with the HPOP or as one of the sensors off the other motor. This sensor does not come with a new HPOP so he would have reused the "old one". Along with the CPS or a fuse the IPR will instantly kill the motor.
3: while cranking for about 5 seconds, does the oil pressure gauge on the dash climb into the "normal" range
4: there are no fluids of any kind in the engine valley
5: you stated that the "check engine" light was not present. Does it at least come on briefly when your cycle the key from off to run? Just asking to make sure that the bulb isn't burned out and there might really be a code in the system. The parts guy is only half true on the check engine light. The auto world has what are called soft codes and hard codes. A hard code would set the light and be readable where a soft code would not set the light and the PCM is looking to see if the fault happens again before setting a hard code. Both are readable but not by all scan tools.
Things to look at right now. Please:
6: the batteries need to be tested off of the trucks harness (just need to pull the positive off the drivers side) to make sure that both batteries are in good working order individually. One bad battery can cause a no start situation because the PCM in the truck NEEDS to see at least 300 sustained engine RPMs before it will allow the injectors to fire.
7: No little miss the IDM is a separate computer that is mounted on the inner fender wall near the windshield under the hood on the drivers side. It is responsible for firing the injectors but only when the PCM, inside the truck behind the kick-panel by the drivers left foot, tells it to. "Generally" if there is no white smoke while cranking then there is a IDM fault BUT the fault may lie in the the PCM (sorry, Ford really did make the injection system on these trucks as hard as possible to understand).
8: The Super Duty glove box manual will tell you that not only are there fuses involved in powering the computers but there are 2 relays in the under hood fuse box that also power the computers. I don't know which one it is on a Super Duty but on our 1st Gen. Power Strokes it is Relay 1 that powers the PCM and relay 2 that powers the IDM. Please swap out the #1 & #2 relays for the #3 (horn) and #4 (trailer brake) relays to see if it is a bad relay.
I think I'll stop there for now and let you see what you can see. If I have typed anything that you don't fully understand (like what does IDM stand for) please do not hesitate to ask. We want you back on the road as much as you do.
Good luck and please keep us Updated.