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I have seen a few OBS trucks show up with a fuel pulse damper installed...


TSB 93-01-16 Fuel Pulse Damper 4.9L
TSB 93-13-09 Fuel Pulse Damper 5.8L

Publication Date: JANUARY 5, 1993

LIGHT TRUCK: 1992-93 BRONCO, F-150-350 SERIES

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.



There was a TSB issued for it back in 1993: Fuel Pulse Damper (courtesy of Steve83)
 
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