So I suspect that you may be hunting for some lost miles per gallon, or perhaps have noticed sluggish performance from your 7.3 Powerstroke. I am going to walk you through locating and cleaning the FPR Screen.
The FPR is designed to maintain the fuel pressure in the cylinder heads at 40 psi. In addition ensuring that the return restrictor doesn't get clogged with grit. It is my understanding that the oring failing and clogging the screen is a myth and rather is gunk from the tank. O-rings are responsible for clogging your spool valve in your FPR, however.
Between step 2 and 3 it is essential that you have a telescoping magnet handy to catch the screen if it falls into the valley (area below the bowl). Mine fell in during install and removal and I retrieved it both times.
Once you have access to the screen you will find this (most likely)
which is the fpr screen covered in a layer of debris.
I have found write ups that suggest using a qtip to clean it, but based upon how tightly packed the gunk was it would be ineffective. When you have the screen out soak it in some break cleaner for roughly 5 minutes. I then scrapped off what I could and then shot it clean with brake cleaner.
Reinstall is simply reverse of removal. I found it helpful on the reinstall to have a screwdriver in my right hand to pry the fpr away from the bowl, use a pair of needle nose to stick the screen in the housing, and then have a screw driver in my left to push it in a bit more.
For the o ring I found it helpful to again pry the fpr away from the fuel bowl and then stick it over the end of a screw driver. I used my finger to block the oring until I got it on the housing it rests on, and then slid it forward. Pushed the housing back into its location and ensured that the oring doesn't get pinched.
As always I declare no responsibility or liability in you breaking something while following my guide.
Information and pictures have been compiled from internet searches and my own personal knowledge.
Replace part numbers contributed via another member here
I verified and they are good! Ford part number 2C3Z-9157-AA seal kit. IH 1825748C92