FUEL FEED AND/OR RETURN PIPE REPAIR PROCEDURES

Model and Year: 1984-89 CHEVROLET PASSENGER AND LIGHT DUTY TRUCK VEHICLES

When making any repairs to the fuel system, it is IMPORTANT that the following procedures be adhered to:

A minimum of 13.0 mm (1/2") clearance must be maintained around sharp edges such as flanges, pinch weld, etc., to prevent contact and chaffing. A minimum of 19 mm (3/4") clearance must be maintained around any moving parts.

- When rubber hose is used to replace pipe, use only reinforced fuel-resistant hose which is identified with the word "Fluorelastomer" or "GM6163-M" on the hose. Hose inside diameter must match pipe outside diameter.

- Do not use rubber hose within 100 mm (4") of any part of the exhaust system or within 254 mm (10") of the catalytic converter.

- In the repairable areas, cut a piece of fuel hose 100 mm (4") longer than portion of the line removed.

If more than a 6 inch length of pipe is removed, use a combination of steel pipe and hose so that the total hose lengths, including the 100mm (4") additional length will not be more than 254mm (10") long. Follow the same routing as the original pipe.

- Cut ends of pipe remaining on car square with a tube cutter. Using the first step of a double flaring tool, form a bead on the end of both pipe sections. If pipe is too corroded to withstand the beading operation without damage, the pipe should be replaced. If a new section of pipe is used, form a bead on both ends of it also.

- Use screw-type hose clamp No. 2494772 or equivalent. Slide clamps onto pipe and push hose 51 mm (2") onto each portion of fuel pipe. Tighten clamps on each side of repair.

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.