Fuel Tank - Pop Noise During Start Up
Bulletin No.: T-93-35File in Group: 6
Number: 30
Corp.Ref.No.: 216303R
Date: Dec. 1992
SUBJECT:
FUEL TANK NOISE DUE TO TANK PRESSURE CONTROL VALVE (TPCV)
MODELS AFFECTED:
1988-1993 DEVILLES AND FLEETWOODS
This bulletin supersedes T-92-112 which should be discarded. This bulletin is being revised to specify a different Tank Pressure Control Valve (TPCV) and part number and to add a model year.
Some 1988-1993 DeVilles and Fleetwoods may experience a condition of fuel tank pop noise during start up. This condition may occur due to vacuum accumulation in the fuel tank--typically in a morning start up. The release of the built up fuel vapor vacuum in the fuel tank at start up could cause a loud popping noise by the fuel tank.
A revised Tank Pressure Control Valve (TPCV), which has a fuel tank vacuum relief valve, can be installed to correct this condition.
To repair this condition use the following procedure:
1. Remove current TPCV
2. Install revised TPCV, P/N 17089068.
Parts are currently available from GMSPO.
WARRANTY INFORMATION
NOTE:
The previous bulletin acknowledged using TPCV, P/N 17091152, which is used on Eldorados and Sevilles. It can be used on DeVilles and Fleetwoods, however, the TPCV control vacuum cover tube must be rotated 180" to align in the same direction as the canister tube. Refer to Figure 1. If the TPCV is not installed correctly, then the vehicle may experience a condition of high tank pressure. Therefore, to avoid having to rotate the TPCV for DeVilles and Fleetwoods another TPCV has been made available that is already in the proper alignment.