Cadillac Seville

I have a 1992 cadillac seville(4.9 liter) my question is, if the fuel pressure is, nt between 40 -50 pounds of pressure should I replace the fuel pressure regulator or the fuel pump or both, also I dont have no other codes or serice engine soon or serice engine now lights are not on now and haven, t been on. Please help
November 3, 2006.

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