Howdy everyone. Im currently trying to replace my FPR but Im having one problem and encountered one oddity.

Problem: The nut holding the FPR to the bracket. Its just plain stuck. I dont know the size on the nut but its bigger than every wrench I have now and my darn adjustable, the only one I have, is too long and hits the master cylinder. I cant even see a seam between the nut and the bracket. It absolutely looks like one piece. PB Blaster and WD40 havent aided me thus far. Any tips?

Oddity: I thought I'd try pulling the fuse to the main fuel pump and letting it run dry to make the FPR job cleaner / less chance of me having a carbeque. So, I pulled the correct fuse, let the car run.... and run... and run. I finally turned it off after it ran for roughly 15 minutes without that fuse. I tried again by pulling the fuses for the main AND pre-pump. Still kept on running. Oddly enough, having any of the fuses removed in any order didnt effect the vehicle running AT ALL. I did notice that in the fusebox, all the wiring had two wires running to each fuse. Except for the main pump and pre-pump. They each only had one wire running to each fuse in the fusebox. Im learning to work on cars with my 240 and my precious Bentley book and Im just confused...

Appologies if I didnt make myself clear enough with any descriptions. Thanks!