FUEL PUMP NOISE AFTER VIN BREAKPOINT- P/N & REPAIR

1988 CUTLASS SUPREME WITH 2.8L V6 ENGINE (VIN CODE W) WITH COMPLAINT OF FUEL PUMP NOISE

Some 1988 Cutlass Supremes assembled prior to the VIN breakpoint JD300211, may exhibit an increased level of fuel pump noise audible in the vehicle passenger compartment.

This condition may be addressed by installing a new fuel pump with contained check valve feature and new tank to underbody insulator pads that have been released as an interim production change.

Service procedure and parts available from GMSPO are indicated below.

SERVICE PROCEDURE

1. Drain and lower fuel tank following applicable shop manual procedures.

2. Remove fuel tank sender and pump assembly.

3. Remove existing anti-squeak material from tank and discard. Clean top of tank.

4. Position and secure eight (8) insulator pads, part number 10114724, to the top of fuel tank as shown in Figure 1.

5. Remove fuel pump from sender assembly and discard.

6. Inspect pulsator to insure it is of the latest design with "dual hump" cover (see Figure 2). If not of the "dual hump" configuration, discard and replace with part number 25094266.

7. Reassemble sender/pump assembly utilizing new fuel pump contained in fuel pump kit, part number 25116156.

8. Install sender/pump assembly into fuel tank utilizing new fuel sender O-ring contained in fuel pump kit.

9. Inspect tank assembly to insure fuel and vapor pipes are properly positioned and retained in fuel line separators/spacers. When properly installed separators/spacers should contact tank top, while clearance is maintained between pipes and tank.

10. Raise and position fuel tank to vehicle underbody and secure in position torquing strap bolts to 34 N-m (25 lbs. ft.).

11. Inspect and correct any obvious tank or sander pipe(s) contact with vehicle underbody.

12. Reconnect fuel/vapor hoses and electrical connector.

13. Start vehicle, inspect for any fuel leakage and repair as required.

Part Number Description ----------- ----------- 25116156 Fuel Pump Kit 10114724 insulator Pad Unit (8 pcs./unit) *25094266 Pulsator

*Only required when existing pulsator is of old style (reference step 6).

WARRANTY INFORMATION

Labor Operation Number: T1324 Labor Time: 1.3 hrs. Trouble Code: 92

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.