CAMPAIGN: DIESEL ENGINE FUEL LINES CLIPPING

MODELS: 1990 CK 15-35 WITH LH6/LL4 6.2L DIESEL ENGINE

The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle which is subject to a recall campaign of this type must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to adequately repair within 60 days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time.

If the condition is not adequately repaired within a reasonable time, the owner may be entitled to an identical or reasonably equivalent vehicle at no charge, or to a refund of the purchase price less a reasonable allowance for depreciation.

To avoid having to provide these burdensome solutions, every effort must be made to promptly schedule appointments with owners and to repair their vehicles as soon as possible. As you will see in reading the attached copy of the letter which is being sent to owners, the owner is being instructed to contact the nearest GMC Zone Office if the dealer does not remedy the condition within five days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed how to contact the National Highway Traffic Safety Administration.

DEFECT INVOLVED

General Motors has determined that a defect which relates to motor vehicle safety exists in certain 1990 CK 15-35 model trucks equipped with 6.2L diesel engines. The front diesel fuel feed and/or return lines of these vehicles can contact the automatic transmission shift linkage cordon shaft and/or, on K models, the front propshaft. If this contact occurs, a hole could be rubbed through the fuel line and a diesel fuel leak may occur near the exhaust crossover pipe. A fuel leak of this type may result in an engine compartment fire.

To prevent this condition from occurring, your GMC dealer will install a new design fuel line routing bracket. Additionally, the fuel lines will be inspected for wear, and if necessary, replaced.

VEHICLES INVOLVED

Involved are certain 1990 CK model trucks equipped with 6.2L diesel engines built within the following VIN breakpoints:

MODEL YEAR PLANT FROM THROUGH ---- ----- ----- ------- 1990 Oshawa L1500724 L1501274 Pontiac East LE500002 LE502838

The specific vehicles involved in this campaign have been identified by Vehicle Identification Number Computer Listings. These listings are furnished to all involved dealers with the campaign bulletin.

DEALER CAMPAIGN RESPONSIBILITY

Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward. Dealers are to inspect and correct all affected vehicles in new and used vehicle stock prior to their sale.

Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service in the future, you should take the steps necessary to ensure the campaign correction has been made before reselling or releasing the vehicle.

Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer and arrangements made to make the required cor- rection according to instructions contained in this bulletin.

If no owner's name and address were available to GMC Truck Division at the time of campaign initiation, the dealer will determine the owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.

GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of owner letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing may contain owner names and addresses obtained from State Motor Vehicle Registration records. The use of such motor vehicle registration data for any other pupose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to this campaign.

SERVICE PROCEDURES

1. Raise vehicle on hoist.

2. Inspect fuel lines at the automatic transmission shift linkage cordon shaft and/or on K models, the front propshaft. If inspection shows wear, it will be necessary to replace the fuel lines. Torque fittings to 20-34 Nm (15-25 lb. ft.). If lines are replaced, also replace "O" rings on feed and return lines.

3. Remove and retain nut (2, Figure 1) holding existing metal fuel line clip (4, Figure 1) to transmission housing and discard metal clip. Also remove plastic fuel lines clip (3, Figure 1) and discard.

TO REMOVE NUTS, THEY MUST BE ACCESSED FROM TOP REAR OF TRANSMISSION FROM UNDERNEATH VEHICLE.

4. Remove nut (2, Figure 3) holding existing transmission harness clip (3, Figure 3) to transmission housing. Retain clip and nut.

5. Install new routing bracket (5, Figure 2) on transmission housing.

BRACKET (5, Figure 2) MUST BE INSTALLED ON STUDS BEFORE CLIPS ARE INSTALLED.

6. Transmission wiring harness (1, Figure 3) must be routed through bracket at this point. Harness must be routed over fuel lines and under upper leg of bracket.

7. Install clip (6, Figure 2) on fuel hnes. Install plastic fuel line clip (4, Figure 2) on lower part of fuel lines.

8. Press rosebuds in lower plastic clip (4, Figure 2) into holes provided in the routing bracket (5, Figure 2).

9. Fasten fuel lines metal clip (6, Figure 2) to upper stud on bracket with nut (2, Figure 2). Torque nut to 20-25 Nm (15-18 lb. ft.).

10. Install transmission wiring harness clip (3, Figure 3) on lower stud of transmission housing and fasten with nut. Torque nut to 20-25 Nm (15-18 lb. ft.).

PARTS INFORMATION

Parts kits required to complete this campaign will be shipped to involved dealers by GMC Truck on a no charge basis. Any questions pertaining to parts shortages, etc., should be directed to Adistra Corporation (313) 455-9072.

DO NOT ORDER KIT FROM GENERAL MOTOR SERVICE PARTS OPERATION (GMSPO).

Each parts kit will consist of the following:

Part Number Description Quantity ------ ------------ -------- 15657366 Bracket, Fuel Lines 1 15657372 Clip, Fuel Lines (Metal) 1 15657371 Clip, Fuel Lines (Plastic) 1

If inspection of fuel lines shows chafing, which requires fuel line replacement, order fuel lines and "O" rings (see part number information below) to complete the campaign from General Motors Service Parts Operation (GMSPO) on a C.I.O. order with no special instruction code but order under an advise code (2).

Part Number Description Quantity ------ ----------- -------- 22516256 "O" Ring - Fuel Return IAne AR 22514722 "O" Ring - Fuel Feed Line AR 15657373 Fuel Feed and Return Line Assembly AR

WARRANTY INFORMATION

Dealers should submit an accurately filled out Warranty Repair Order on each vehicle completed under this campaign.

LABOR OPERATION *TME **PARTS TROUBLE NUMBER DESCRIPTION ALLOWANCE ALLOWANCE CODE ------ ----------- --------- ---------- ---- V5820 Inspect fuel lines for .4 Hr $.80 96 chafing - Install new bracket

V5821 Inspect fuel lines for .8 Hr $.80 96 chafing - Replace fuel line and install new bracket

*For dealer to receive Administrative Time Allowance associated with this campaign, add 0.1 hour to the Labor Operation Time Allowance.

**The $.80 amount identified in the "Parts Allowance" column above represents 30% of dealer net for parts that were furnished by GMC Truck Division. This amount is to be placed in the Net Item Amount column of the claim and use type Code "M".

CAMPAIGN IDENTIFICATION LABEL

Each vehicle corrected in accordance with the instructions outlined in this product campaign bulletin will require a "Campaign Identification Label". Each label provides a space to include the five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ball point pen.

Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.

Apply "Campaign Identification Label" only on a clean, dry surface.

ADMINISTRATIVE PROCEDURE

Procedures covering this campaign are outlined in Section V of your dealership's "GM Truck Claims Processing Manual" #P 8919.

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.