But if you insist, while you can check directly at the output side of the filter itself, I would recommend checking for fuel pressure after the filter at the schrader valve of the common fuel rail which supplies fuel to the injectors. Checking for pressure before the filter checks the integrity of the fuel pump.
If you have already replaced the filter and the pump is normally supplying fuel yet the fuel pressure is low then you may have a bad fuel pressure regulator.
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