Century Estate Wagon V6-231 3.8L (1985)
Fuel Pressure Pulsation Damper: Customer Interest
Fuel Pump - Noise
Bulletin
87-6C-3
Date
July '87
Ref. No. 87-128-6C
Corp. Ref. No. 736304
SUBJECT:
FUEL PUMP NOISE
MODELS AFFECTED: 1985-87 CENTURY COUPES AND SEDANS WITH (LB6, VIN W), (LN3, VIN 3), (LG2, VIN B), (LG3, VIN 3)
Some 1985-87 Century sedans and coupes with V-6 engines (RPO LB6, LG3, or LN3), may exhibit what is considered to be an objectionable level of
fuel pump noise audible in the vehicle passenger compartment.
This objectionable level of noise may be attributed to any of the components or conditions noted below:
1.
Fuel Pump
2.
Pulsator
3.
Inadequate pump discharge port to sender feed pipe clearance.
4.
Improper tank to underbody position/ isolation resulting in ground out.
Vehicles exhibiting this condition may be repaired by following the procedure below:
1.
Drain and lower fuel tank following applicable Buick Chassis Service Manual procedures.
2.
Remove existing anti-squeak material from tank and discard.
3.
Clean top of fuel tank and remove fuel sender/pump assembly.
FIGURE 1
4.
Remove and discard pulsator. Inspect to ensure a minimum distance of 1/4" exists between pump discharge port and sender feed pipe, (See Figure
1). Replace sender as required (see GMSPO parts catalog for correct application).
5.
Inspect pump under foam isolation sleeve for part number. If part number is either 6442409 or 6442439, replace pump (see GMSPO part catalog
for correct application).
6.
Reassemble sender/pump assembly utilizing new pulsator, Part Number 25093965, ensuring pump and pulsator are positioned properly (Figure 1).
7.
Install sender/pump assembly into fuel tank utilizing new fuel sender O-ring, Part Number 22515965.
8.
Cut each of the long isolation strips contained in Sound Isolation Kit, Part Number 22530899, to lengths noted below:
2 pcs.
-
3-1/2"
