Hello! Welcome to justanswer!
What engine do you have?
Heres the picture of it:
The pressure regulator is part of the fuel filter and is bolted to the frame right near the fuel tank.
Take the feed line off and put a gauge right on it.
All that matters is if the pump can build pressure. From here it looks like its the pump. if the regulator was bad, it wouldn't run at all. But, you should do the pump and the filter at the same time.
Ok, this makes the problem something totally different so put everything back together. The Computer can't read the chip in the key. Only Chrysler or a real good Locksmith can reprogram the key back to the car. The computer thinks the lock has been picked.