Here is practical testing for "pressure regulator " from V-10 archives .


Fuel pressure should be 28-30 psi at idle, 38-40 psi with vacuum disconnected at the regulator.

Disconnect the vacuum at the regulator and watch the gauge. If it doesn't change, and there is vacuum on that hose, the regulator is obviously bad.

The other side of the coin is , IF there is no vacuum on that hose ( as in a vacuum leak somewhere in the system ) , that is not the fault of pressure regulator .

My 2003 has a different EGR system , so I can't help with the hose question.

Good luck,
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