STOP Guessing!
There's a whole system in place ready to help you find the problem. If your gonna keep & maintain the truck yourself I strongly suggest you get access to the special scanner software you need to do it. Unfortunately it takes something other than a Generic OBD-II scanner, like the Auto Parts Stores use, to scan, test, and retrieve codes.
Here you have a couple of the most common choices;
1) If you want to do Everything you'll ever need to, then look at the AutoEnginuity + the Ford Enhanced Package (@ $350 - you add an old computer of some sort to run it with)
2) To retrieve most of the codes you'll need to help and even do
some testing look at the Torque App (you add an Android device and Blue Tooth Adapter for @ $30) OR the Windoze version of ForScan with a USB adapter.
Just a few years ago you needed to buy a professional scan tool because our trucks need to have a scanner with a Library containing both the Ford Proprietary AND the Diesel Specific codes in it. Add to that, our trucks are Not, specifically, OBD-II so the Generic scanners the Auto Parts Stores have are of little use to us. But today there are some very good App based tools, that are close to what the pro tools do, for fraction of the cost.
http://www.powerstroke.org/forum/99...n/1044057-ford-superduty-diagnosis-cheap.html
This could be MANY things, but here's my usual No Start List;
WTS Light? - do you get it when you first roll-on the key? (shows the computer is running)
Do you see cranking rpm on the Tach? Do you have a spare CPS to try? See below for how to tell if YOUR '01 should show this***
Is there fuel in the fuel bowl now? Does it refill after cranking? (open the drain level to check) Look above the pass ft tire, you'll see a 3/8" metal tube, against the motor that ends there, it's the drain for the bowl (yellow lever you slide to the side). Get a cup, open the lever, drain the fuel bowl, look at the fuel, close the lever. Then, turn the key to the ON position (should hear the pump) for 15 secs. Drain the fuel bowl again, whaddya got?
Can you hear/feel the pump running (below the dr seat, against the framerail)
Could the fuel gauge be giving a bad reading? (Below 1/4 tank?)
Is it cranking fast enough? - it won't even TRY to start if cranking too slowly.
Is your truck "chipped"? If so, remove it as a Test.
You can unplug the ICP sensor, as a Test, so the PCM sets a default value for the IPR to run on.
Did you check the plug and sheet metal nut going to the IPR? That nut can vibrate off and allow the solenoid going over the valve to slide around. The wires going to the IPR can get brittle, crack, and short together. Make sure the plug & wires look in good shape.
*** On the some '01s and all Earlier -If you Do NOT have a trans temp gauge in the instrument cluster (means you have an "early '01" w/o the electrical upgrade) then you should see cranking rpm on the tach as you crank it on the starter (means the CPS is doing it's job)