F 150 2WD Pickup V8-351 5.8L Lightning (1993)
Fuel Supply Line: Customer Interest
Fuel Lines - Knocking Noises
Article No.
93-1-16
01/05/93
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FUEL SYSTEM - 4.9L - "KNOCKING" NOISE TRANSMITTED THROUGH FUEL LINES - VEHICLES BUILT BEFORE 10/1/92
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NOISE - "KNOCKING" SOUND TRANSMITTED THROUGH FUEL LINES - 4.9L ENGINE VEHICLES BUILT BEFORE 10/1/92
LIGHT TRUCK:
1992-93 BRONCO, F-150-350 SERIES
This TSB article is being republished in its entirety to include early built 1993 model vehicles.
ISSUE:
A fuel system "knocking" noise may be heard. The noise is caused by fuel injector pulsations that are transmitted through the fuel lines.
ACTION:
Install a new front fuel line assembly with a pulse damper. Refer to the following procedure for service details.
1.
Relieve the fuel system pressure. Refer to the 1992 F-150-350, Bronco Service Manual, Page 10-01A-26, for fuel system pressure relief
procedure.