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ISSUE: A “whining/buzzing” noise in the speakers of the entertainment radio or two-way radio on vehicles with an
in-tank electric fuel pump may be caused by electrical noise from the fuel pump. ACTION: Install an electronic noise Radio Frequency Interference (RFI) filter (F1PZ-18B925-A) on the fuel pump inside the fuel tank. Refer to the following Test Procedure to confirm that the concern exists, then refer to the Service Procedure for repair details. TEST PROCEDURE Fuel pump radio noise is relatively constant and changes only slightly with vehicle speed. If the frequency of the noise varies or the noise comes and goes with the vehicle speed, then it is not the fuel pump and this fix will not be effective. The following procedure will help determine if the fuel pump is the cause of the radio noise: 1. Turn on the radio before the key is turned on (assuming the radio will operate without the ignition key - you may need to put the ignition key in the Accessory position). Turn the ignition key to the Run position (do not start the engine) check the appropriate Electrical and Vacuum Troubleshooting Manual (EVTM) (or other service literature) for the location of the fuel pump ground. If ground is more than 0.9m (3′) from the tank, cut wire and ground fuel pump end within 0.9m (3′) of the tank to prevent ground wire from acting as an antenna. Be sure ground is secure and protected from corrosion since it is the operating ground for the fuel pump.
Vehicle Series : 990-93 TEMPO 1990-97 PROBE, THUNDERBIRD 1990-98 ESCORT, TAURUS 1990-99 CROWN VICTORIA, MUSTANG 1997-98 CONTOUR LINCOLN-MERCURY: 1990-92 MARK VII 1990-93 TOPAZ 1990-96 CONTINENTAL 1990-97 COUGAR 1990-98 SABLE, TOWN CAR 1990-99 GRAND MARQUIS 1991-98 TRACER 1997-98 MYSTIQUE 1997-99 MARK VIII LIGHT TRUCK: 1990 BRONCO II 1990-96 BRONCO 1990-97 AEROSTAR, F SUPER DUTY, F-250 HD, F-350 1990-98 ECONOLINE 1990-99 F-150, F-250 LD, RANGER 1991-98 EXPLORER 1993-98 VILLAGER 1997-98 EXPEDITION, MOUNTAINEER, WINDSTAR 1998 NAVIGATOR.
Tags : radio frequency interference, electric fuel pump, bronco ii, lincoln mercury, grand marquis, service literature, radio noise, ford series, ground fuel, entertainment radio, repair details, crown victoria, electronic noise, turn on the radio, f 250
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