I just checked my CD and this is what it says:
1.Remove the air cleaner assembly and the air inlet tube. Refer to «Section 03-12».
2.Remove the fuel pressure regulator cap, spring, and spool valve from the fuel control valve.
3.Thoroughly clean the fuel pressure regulator bore in the fuel control manifold.
Installation
1.Follow the removal procedure in reverse order.
In five years on diesel forums I have yet to see a post about removing the fuel pressure cap, spring and spool valve.
BTW, I have used Q-Tips for the last five years and never removed the screen. I fear what the inside of the screen looks like. Is there a recess where the screen fits and the o-ring is outside of it?