7.3 died and won't start. ICP or IPR?

[NB99F250]

I can't find on the forum how to test for the ICP or IPR.

Here is what I have my 99 7.3 died on the road and won't start. I replaced the fuel pump and CPS before I read this forum to find out that wasn't my problem. The truck cracks good. I don't have a WTS light. I don't show any codes that pertain to the starting of the truck. From what I have read here I think it is the ICP or IPR. I unplugged the ICP and the wires r good but the connection is covered in some oil. I cleaned and nothing.

Do I replace the ICP or IPR next?

[NoRalPh]

Unpluging the ICP, it will let the PCM set a default pressure for the IPR to run on.

The IPR is a bit trickier, you can't just unplug it. But you can look at it visually to be sure the plug looks good (no insulation missing) and the "tin nut" is still there and holding the coil onto it tightly. Maybe "rap" on it with something to see if you can dislodge a stuck pintle. The IPR can also be disassembled and inspected.

What makes you think it either of those though? It could be Many things, and the most likely, with no WTS light, would be a shorted Fuel Heater and a blown fuse not letting the PCM run. Look into that first, you Should have a WTS light!

[~CrazyDiesel~]

If it was cold out, the fuel bowl heater may have shorted out. It's been so long since I've been under the hood of a 7.3 I forget which fuse it is. But #27 and #30 come to mind. The fuel heater and the PCM share the same fuse. If I am correct, Unplug the heater and you should be able to replace the fuse drive on. The heater keeps collllddd diesel from gelling on the filter.

[NB99F250]

Thanks. I could have sworn I checked all my fuses but I found one blown...... Fuel heater was in pieces.