Fuel Pump - High Pitched Noise
NO: 14-02-94GROUP: Fuel System
EFFECTIVE DATE: Feb. 11, 1994
SUBJECT:
Fuel Pump Noise
NOTE:
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 14-12-93 DATED JUL. 9, 1993 WHICH SHOULD BE REMOVED FROM YOUR FILES. THE PARTS INVOLVED AND THE REPAIR PROCEDURE ARE DIFFERENT. THIS IS A COMPLETE REVISION.
MODELS:
1991 - 1994 (AS) Town & Country/Caravan/Voyager
NOTE:
THIS BULLETIN APPLIES TO FRONT WHEEL DRIVE VEHICLES.
SYMPTOM/CONDITION:
The fuel pump produces a high pitched noise while running that is objectionable to the customer. The fuel pump noise will be most noticeable at idle with all accessories turned off. It is normal to be able to hear the fuel pump running while listening outside of the vehicle or while sitting in the rear of the vehicle.
DIAGNOSIS:
With all the windows and doors closed, the engine running, and all accessories turned off, listen for the fuel pump while sitting in the drivers seat. If excessive fuel pump noise is heard, perform the repair procedure.
PARTS REQUIRED (see illustration)
REPAIR PROCEDURE:
This bulletin involves installing a revised fuel pump, wiring harness (if applicable), fuel tank isolators and revised fuel tank straps.
1 Using the procedure outlined in the appropriate Service Manual, i.e., 1993 Front Wheel Drive/All Wheel Drive Service Manual (Publication No. 81-370-3105) starting on Page 14-16, drain and remove the fuel tank.
2. Inspect the vehicle for presence of isolated fuel tank straps (P/N 4682784). Isolated straps are painted black and have a rubber pad between the tank and the strap. The old non-isolated straps are silver in color. If the straps are the new isolated version, verify the fuel pump is P/N 4682761. Replace all parts that are not the revised design.
3. FUEL PUMP REPLACEMENT
A) On 1991-1993 model vehicles, disconnect the fuel pump module wiring harness from the body harness and discard it.
B) On 1991-1993 model vehicles, connect the revised fuel pump module wiring harness (P/N 4688376) to the body harness.
C) Using the procedure outlined in the appropriate Service Manual, i.e., 1993 Front Wheel Drive/All Wheel Drive Service Manual (Publication No. 81-370-3105) starting on Page 14-8, remove the fuel pump module.
D) Using the procedure outlined in the appropriate Service Manual, i.e., 1993 Front Wheel Drive/All Wheel Drive Service Manual (Publication No. 81-370- 3105) starting on Page 14-10, install the revised fuel pump module (P/N 4682761).
4. FUEL TANK ISOLATION COMPONENT INSTALLATION
A) Remove all tar paper material from the top of the fuel tank and/or the fuel tank stringers of the floor pan.
B) Remove the backing paper from the foam insulators (P/N 4682788) and apply to the top of the fuel tank. Begin applying the foam insulators at the front weld flange where the old tar paper was (refer to the illustration).
C) Using the procedure outlined in the appropriate Service Manual i.e., 1993 Front Wheel Drive/All Wheel Drive Service Manual (Publication No. 81-370- 3105) starting on Page 14-18, install the fuel tank with the revised straps (P/N 4682784) and the revised bolts (P/N 6501893). Torque the bolts to 40 ft.lbs. (54 N-m).
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No. 14-50-90-98.........1.1 Hrs.
FAILURE CODE: 68 - Noisy