To test the fuel pressure, you need a fuel pressure tester.
Call around to local auto parts stores and tool rental places you may be able to rent one. If not, Harbor Freight has one for $20.
https://www.harborfreight.com/fuel-i...ter-62623.html
The test port is opposite the fuel pressure regulator (see pic I posted previously). It looks similar to a tire air valve, the tester connects there. Check pressure with engine idling, this is the minimum pressure and should be at 30-32 psi. Then disconnect the vacuum line on the fuel pressure regulator (engine still idling), this is MAX pressure and should be 39-40 psi. If all appears good then you should still do a test with a REAL load on the engine to see if the 39 psi holds under extended load conditions. Leave the tester connected and go for a test drive (you may need to leave the engine cover off) that will put the engine under load, like a long hill. The pressure should maintain 39 psi or so under load. If it fails any of these tests then it is time for a new pump. RockAuto.com has a good price on the OEM Motorcraft pump assembly.
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