Fuel Pump - Buzzing/Humming After Engine Shut Down

90ford25
^ NO START - 1.9L, 2.3L, 3.0L, 3.8L, 4.9L, 5.0L, 5.8L, 7.5L - LOW STATE OF BATTERY CHARGE

^ BATTERY - DISCHARGED - 1.9L, 2.3L, 3.0L, 3.8L, 4.9L, 5.0L, 5.8L, 7.5L

^ FUEL PUMP - NOISY - 1.9L, 2.3L, 3.0L, 3.8L, 4.9L, 5.0L, 5.8L, 7.5L

^ NOISE - "BUZZING" OR "HUMMING" FROM FUEL PUMP AFTER ENGINE IS TURNED OFF
Article No. 90-18-3
FORD: 1983-90 CROWN VICTORIA, ESCORT, EXP, MUSTANG, TEMPO, THUNDERBIRD 1986 LTD 1986-90 TAURUS

LINCOLN-MERCURY: 1983-87 LYNX

1983-90 CONTINENTAL, COUGAR, GRAND MARQUIS, MARK VII, TOPAZ, TOWN CAR 1985-86 CAPRI, MARQUIS 1986-90 SABLE

LIGHT TRUCK: 1983-90 BRONCO II, BRONCO, ECONOLINE, F-150, F-250, F-350, RANGER 1988-90 F SUPER DUTY
ISSUE: A "buzzing" or "humming" noise from the fuel pump may occur after the engine has been shut off. There may also be a no start condition or a discharged battery. These conditions are caused by a sticking fuel pump relay.

ACTION: Install a new fuel pump relay. Refer to the following procedure for service details.

1. Check the fuel pump relay circuit for proper operation. Refer to the appropriate EVTM for troubleshooting details.

2. Install a new fuel pump relay, if the old one is defective.

3. Check the vehicle for proper operation.

PART NUMBER PART NAME

F19Z-9345-A Fuel Pump Relay Assy.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION DESCRIPTION TIME
901803A 1985-86 LTD/Marquis 0.6 Hr.
(includes pinpoint test)
901803A 1990 Town Car (includes 0.4 Hr.
pinpoint test)
901803A All Other Cars (includes 0.5 Hr.
pinpoint test)
901803A All Trucks (includes pinpoint 0.5 Hr.
test)
DEALER CODING
BASIC PART NO. CONDITION CODE
9345 09
OASIS CODES: 404000, 603300, 203000, 203100, 702000