Turbo or N/A?
If you're not getting power to the fuel pump, the FPR isn't the thing to be worrying about...
EDIT:
Nevermind, I looked back and see it's an N/A.
You might need to rent a fuel pressure gauge set to check the pressure at the fuel rail. Typically, there's enough pressure to get the car to stumble for a bit if not idle roughly... at least from what I've seen.
Have you tried to crank the engine with FP and B+ jumped?
Have you tested the injectors?
MK3 TSRM On-Line