Fuel System - Pump Noise
88pontiac03Bulletin Number: 88-6-23
Reference Number: 836305
Publish Date: 2/88
Subject: FUEL PUMP NOISE
Models
Affected: 1988 GRAND PRIX
Some 1988 Grand Prix models assembled prior to the VIN breakpoint "JF202360" 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 a interim production change.
Service procedure and parts are available from GMSPO as 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.
FIGURE 1:
4. Position and secure eight (8) insulator pads, P/N 10114724, to the top of fuel tank as shown in Figure 1.
5. Remove fuel pump from sender assembly and discard.
FIGURE 2:
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 P/N 25094266.
7. Reassemble sender/pump assembly utilizing new fuel pump contained in fuel pump kit, P/N 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 25 ft.lbs.
11. Inspect and correct any obvious tank or sender 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).
Labor Operation Number: T1324
Labor Time : 1.1 Hours