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Where is the fuel pressure regulator on a 1990 ford bronco?

On a 1990 Ford Bronco, the fuel pressure regulator is integrated into the fuel rail. It's not a separate, easily identifiable component like on some vehicles. You'll find it on the fuel rail itself, usually near the end opposite the fuel filter. You'll likely need to remove the air intake and possibly some other components to get a clear view of the fuel rail and the regulator.