Fuel Pump - Noise Audible In Passenger Compartment: Overview
88oldsmobile16SUBJECT ELECTRIC FUEL PUMP NOISE AUDIBLE IN PASSENGER COMPARTMENT - DIAGNOSIS AND NEW PARTS
1984-88 CUTLASS CIERA 1985-88 NINETY-EIGHT
MODELS/YEARS 1986-88 DELTA 88
1988 CUTLASS SUPREME
NUMBER: 88-T-105
CORP. REF. NO.: 806301R
DATE: September 1988
SECTION: 6C
MODELS AFFECTED: Some 1984 through 1988 Cutlass Cieras; 1985 through 1988 Ninety-Eights; 1986 through 1988 Delta 88 and 1988 Cutlass Supreme models equipped with port fuel injected engines (VIN Codes 3, B, C, L and W).
NOTICE: This bulletin supersedes several previous fuel pump noise communications including
Dealer Technical Bulletins: 85-T-51, 86-T-39 and all DCS messages due to the recent availability of turbine and contained check valve fuel pumps and a change in the service correction procedure. Please discard all previous communications listed above and replace them with this revision. This will supplement the Service Alert on multi-port fuel system noise diagnosis and repair.
Some models equipped with Port Fuel Injected engines may develop a fuel pump noise condition which some customers might consider to be at an objectionable level.
Although various components and/or ground out conditions can contribute to this noise level (i.e., pulsators, interference between the fuel lines, fuel tank, and underbody), the root cause of this condition is the fuel pump.
To repair this condition, use the service procedure listed below for the appropriate year and model application: