Date: APRIL 1987
Subject: FUEL RETURN PIPE RATTLE/KNOCK
Model and Year: 1985-86 CORVETTE
TO: ALL CHEVROLET DEALERS
Some 1985-86 Corvettes may exhibit a hammering/knocking type noise audible in the vehicle
passenger compartment after a cold start, which normally diminishes after 3-4 minutes of
This condition may be caused by pressure pulsations in the fuel system generated by fuel
injector operation, resulting in hydraulic hammering in the chassis fuel pipes.
Vehicles exhibiting this condition may be repaired by installation of a filter-accumulator
assembly in the fuel return system. Service kits containing required parts and
installation instructions are noted below by body style and are available from GMSPO.
||Service Kit P/N
Labor Operation Number: T1195
Labor Time: 1.4 Hours
Add: 1.1 Hours for Convertible