Fuel pressure should be between 35-45 PSI with the key on, engine off or 28-50 PSI with the engine running. This is definitely a fuel problem.
Here are some possible causes for your low fuel pressure: Clogged fuel filter, bad fuel pump, Bad fuel pressure regulator, Stuck open fuel injector, or a circuit issue with the fuel pump (fuel pump relay, wiring and electrical connections).
Fuel system pressure is regulated at the pressure regulator on the fuel rail by the fuel injectors. There's a vacuum hose that connects to it also.
Ford does have a history of having issues with the fuel inertia cut off switch causing fuel delivery problems. Sometimes tapping this switch with the end of a screwdriver will aggravate the circuit making it worse or work better. You could bypass this switch altogether to test if it gets better. Don't leave it bypassed though. This switch is located behind the kick panel area on the passenger side footwell under the dashboard.
Let us know what you find or if you have any other questions.
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Friday, June 14th, 2024 AT 9:08 AM