I checked the service manual and pressure is correct. And also the check valve is part of the fuel filter, so that is a double fix. And the pressure test port is on the fuel rail itself, that feeds all of the injectors.
Test it with engine running, then shut it down, it should hold pressure. I have seen cars with bad pumps run on pressure in the low teens, which was great, once discovered , it was obvious that was the issue. If a car tests at say 45-50, which is out of spec, but might not mean anything.
Look in service manual




FUEL DELIVERY 14 - 19




The pressure regulator is a mechanical device that is calibrated to maintain fuel system operating pressure of


between 3.7 - 4.2 bar (54 - 61 psi) at the fuel injectors.


Fuel is supplied to the fuel filter/fuel pressure regulator by the electric fuel pump directly.


The fuel pump assembly contains a check valve to maintain some fuel pressure in the system when the engine is


not operating.