Fuel Lines - Knocking Noises

Article No.
93-1-16

01/05/93

^ FUEL SYSTEM - 4.9L - "KNOCKING" NOISE TRANSMITTED THROUGH FUEL LINES - VEHICLES BUILT BEFORE 10/1/92

^ 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.











2. Remove the existing front frame to engine fuel line assembly. Refer to Figures 1 and 3 for fuel line disconnecting procedures on each end.

3. If any material was installed to isolate the "knocking" noise previously, remove it.

4. Install the new front fuel line assembly (F3TZ-9J338-G or F3TZ-9J338-H) with the pulse damper. Refer to Figures 2 and 3 for installation procedure.

5. Check the system to be sure there are no leaks.

PART NUMBER PART NAME CLASS

F3TZ-9J338-G Front Fuel Line Assembly C
(Bronco And Regular Cab F-Series)
F3TZ-9J338-H Front Fuel Line Assembly C
(Super Cab F-Series)

SUPERSEDES: 92-24-11

WARRANTY STATUS:
Eligible Under Bumper To Bumper Warranty Coverage And 1992 And Later Model Emissions Warranty

OPERATION DESCRIPTION TIME
930116A Replace Front Fuel Line 0.4 Hr.

DEALER CODING
BASIC PART NO. CONDITION CODE
9J338 56

OASIS CODES:
404000, 497000, 499000, 702000, 702100