After just replacing the tiny internal fuel pump in my All-in-One DMCH unit, I can't stress enough the importance of cleaning out the tank when you install it. My pickup filter was NASTY, which makes me believe that the PO of my car didn't do a very good job, if he did it at all.
In addition, take this opportunity to replace the main Fuel Filter as well, since I see you ordered it. Have you checked your fuel accumulator yet? It might be a good idea to take a look in the cubby to see what's doing in there. This is what awaited me when I bought my car:
What you see here is the ORIGINAL fuel accumulator and rubber lines. Note that the rubber is crumbling off, revealing the white reinforcing fibers underneath. Yeah, that's not good.
Having a known-good fuel system from the tank to the Fuel Distributor is a nice feeling.