FUEL LINE KNOCK - COLD START INSTALL FUEL FILTER-ACCUM.ASSY

VEHICLES AFFECTED: 1985-86 'Y' CAR

Some 1985-86 Corvettes may exhibit a hammering/knocking type noise audibly in the vehicle passenger compartment after a cold start, which normally diminishes after 3-4 minutes of engine operation.

This condition may be caused by pressure pulsations in the fuel system generated by fuel injecter 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 GM Service Parts.

Body Style Service Kit P/N

Coupe 10068791 Convertible 10068797

Use applicable Labour Operation Number and Time.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.