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The fuel pressure spec. when running is 28 - 45 PSI.
The spec. with the key on engine off is 35 - 45 PSI.
I have attached the specs. from the book to confirm the specs. CLICK HERE
I have also attached the pinpoint test for P0174. CLICK HERE .....
The fuel pressure test is done with the vacuum line attached. If you take the fuel pressure regulator vacuum line off the pressure will go to max.