There is no pressure regulator only one is built into the fuel tank to relive the pressure look on fuel rail for a small valve looks like a valve stem similar to tires stem it as a black plastic cover unscrew that and push with a pointy object
The fuel filter on my 1993 grand voyager was in the middle of the car underneath. I don't remember any real fuel pressure in the line when I changed mine. I just put a pan under the filter unplugged it and connected the new one.
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