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How do I find out what the fuel pressure should be for a 1997 Ford Crown Victoria 4.5L? I got the engine codes P0171 and P0174.

Vehicle: 1997 Ford Crown Victoria 4.5L

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besides checking fuel pressure, I would also check for intake leaks, clean the mass air flow meter with mass air flow sensor cleaner and maybe release the fuel filter (on the frame rail under the car on the driver side)

see specs below for fuel pressure.

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