Ford 8L5Z-9H307-F Kit

Always ensure there is fuel in the tank before assuming the fuel pump is defective. An electric fuel pump malfunction typically leads to a loss of fuel flow or pressure, often resulting in decreased performance or a no-run condition. Verify that the pump operates by removing the fuel filler cap and having someone turn the ignition switch to On; a brief whirring noise should indicate the pump is pressurizing the system. If the pump does not run, check the fuel pump fuse and relay. If these components are functional, test the inertia switch for continuity. If the fuse is blown, replace it and check if the pump operates; if it blows again, investigate the fuel pump circuit for a short to ground. If the pump remains silent despite a good fuse, unplug the electrical connector from the fuel pump, ground the negative terminal, and apply 12-volts to the feed terminal. If the pump still does not run, it needs replacement; if it does run, the issue lies within the electrical circuit. The fuel pressure regulator is located in the fuel tank with the pump, and the system includes a fuel pressure damper on the fuel rail to reduce pulsations. Relieve the fuel pressure, connect a fuel pressure gauge to the Schrader valve on the fuel rail, and turn the ignition switch to On. The pump should run for about two seconds, and the pressure should stabilize. If the pressure exceeds specifications, check for a faulty regulator. If it is lower than specified, replace the fuel filter, inspect for pinched or clogged hoses, check for leaks in the fuel feed line, and examine for leaking injectors. After turning the ignition switch to OFF and waiting one minute, recheck the pressure; if it is less than specified, there may be a leak in the fuel delivery line or quick-connect fitting, leaking injectors, or a defective fuel pump. Finally, relieve the fuel system pressure and remove the gauge after testing.

After testing, you should check hold pressure and inspect for leaks or defects in the fuel system components, injectors, or pump, and relieve fuel pressure.

Apply a thin coat of heavy grease to the new lock ring seal to hold it in place during assembly.