Radio/Two-Way Communications - Whine/Buzz
91ford23
Article No. 91-17-5
08/21/91
^ FUEL SYSTEM - FUEL PUMP "WHINE/BUZZ" NOISE COMES THROUGH ENTERTAINMENT OR TWO-WAY COMMUNICATION RADIO
^ RADIO - ENTERTAINMENT OR TWO-WAY COMMUNICATION - "WHINE/BUZZ" NOISE CAUSED BY FUEL PUMP
^ NOISE - "WHINE/BUZZ" - COMES THROUGH ENTERTAINMENT OR TWO-WAY COMMUNICATION RADIO
FORD: 1984 THUNDERBIRD
1984-85 MUSTANG
1984-86 LTD
1985-87 TEMPO
1986-89 TAURUS
1987 EXP
1987-90 ESCORT
LINCOLN-MERCURY: 1984 CONTINENTAL, COUGAR, MARK VII
1984-85 CAPRI
1984-86 MARQUIS
1985-87 TOPAZ
1986-89 SABLE
1987 LYNX
LIGHT TRUCK: 1985-87 RANGER
1985-88 BRONCO, F-150-350 SERIES
1986 AEROSTAR
1986-87 BRONCO II
1986-91 ECONOLINE
ISSUE: A "whining/buzzing" noise may come from the entertainment or two-way communication radio on vehicles with an in-tank electric fuel pump. This occurs because of electrical interference from the fuel pump.
ACTION: Install a noise filter kit (E7PZ-9B357-A) consisting of an RFI noise filter, electrical terminals and a piece of shrink tubing. Refer to the following service procedure.
1. Remove the fuel pump/sender unit from the fuel tank. Refer to the appropriate Shop Manual for removal procedure.
2. Disconnect the heavy red and black wires from the pump terminals.
3. Inspect the fuel pump electrical terminals.
^ If the fuel pump has threaded terminals, go to Step 4.
^ If the fuel pump has spade terminals, go to Step 7.
Figure 1:
4. For Threaded Terminals - Insert RFI noise filter into the pump collar and onto the threaded terminals, Figure 1.
a. Observe polarity marking on fuel pump and RFI noise filter.
b. Install nuts and tighten securely.
5. Cut the ring terminals from the red and black wire ends and discard.
CAUTION: BE SURE NOT TO CUT THE WIRE TOO SHORT.
a. Install a 1" (25.4 mm) piece of heat shrink tubing over each end of wire.
b. Install the small female spade terminal onto the red wire and the large female spade terminal onto the black wire.
c. Crimp and solder new terminals onto the wires.
d. Put shrink tubing over the new crimp and solder connection.
6. Install wires on the RFI noise filter terminals.
NOTE: BE SURE TO OBSERVE POLARITY MARKINGS.
Go to Step 12.
Figure 2:
7. For Spade Terminals - Measure from fuel pump electrical connectors toward the mounting flange and cut two (2) two inch jumper wires from the pump wires, Figure 2.
a. Install a 1" (25.4 mm) piece of heat shrink tubing over each end of wire.
b. Install the small female spade terminal onto the red wire end and the large female spade terminal onto the black wire end.
c. Crimp and solder new terminals onto the wires.
d. Put shrink tubing over the new crimp and solder connection.
8. Strip 3/8" (9.525 mm) of insulation from each end of the wires attached to the mounting flange.
a. Slide a 1" (25.4 mm) piece of heat shrink tubing over each end of wire.
b. Wrap and solder the wires to the ring terminals of the RFI noise filter (red wire to positive terminal, black wire to negative terminals).
c. Push heat shrink tubing over soldered wire ends and shrink.
9. Attach jumper wires to the RFI noise filter spade terminals.
NOTE: BE SURE TO OBSERVE POLARITY MARKINGS.
10. Attach the jumper wires to the electrical fuel pump terminals.
NOTE: BE SURE TO OBSERVE POLARITY MARKINGS.
11. Use tie straps to attach the RFI noise filter to the pick-up/return tubing of the pump/sender unit.
NOTE: MAKE SURE WIRES ARE SECURELY ATTACHED.
12. Reinstall the fuel pump/sender in the vehicle. Refer to the appropriate service manual for service details and required parts.
PART NUMBER PART NAME CLASS
E7PZ-9B357-A Noise Filter Kit C
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 87-20-13
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION DESCRIPTION TIME
911705A Aerostar, Ranger And 1.5 Hr.
Econoline With Mid-Ship
Fuel Tank.
911705B F-Series With Mid-Ship Fuel 1.3 Hr.
Tank Or Ranger With Aft Of
Axle Fuel Tank.
911705C Bronco II, F-Series And 1.6 Hr.
Bronco With Aft Of Axle
Fuel Tank.
911705D Econoline With Aft Of Axle 1.2 Hr.
Fuel Tank.
911705E Additional Time - F-Series 0.2 Hr.
Equipped With Spare Tire
Carrier.
911705F All Cars 1.3 Hr.
DEALER CODING
BASIC PART NO. CONDITION CODE
9H307 56
OASIS CODES: 205000, 207000, 404000, 702000