TrailBlazer 2WD L6-4.2L VIN S (2003)
Fuel Filler Neck: All Technical Service Bulletins
Fuel System - Fuel Spit-Back/Early Pump Nozzle Shut-Off
Bulletin No.: 04-06-04-003A
Date: August 11, 2004
TECHNICAL
Subject:
Vehicle is Difficult to Fill with Fuel or Filling Station Pump Shuts Off Before Tank is Full or Fuel Spits Back/Out When Filling Tank (Replace Fuel
Tank Filler Upper Pipe and Lower Hose)
Models:
2003 Chevrolet TrailBlazer with 83 L (22 Gallon) Fuel Tank (RPO NNK)
2003 GMC Envoy with 83 L (22 Gallon) Fuel Tank (RPO NNK)
2003 Oldsmobile Bravada with 83 L (22 Gallon) Fuel Tank (RPO NNK)
2002-2003 Chevrolet TrailBlazer EXT
2002-2003 GMC Envoy XL
2004 Buick Rainier
2004 Chevrolet TrailBlazer, TrailBlazer EXT
2004 GMC Envoy, Envoy XL, Envoy XUV
2004 Oldsmobile Bravada
Built Prior to December 2003
Supercede:
This bulletin is being revised to provide new part number for 2002-2003 vehicles. Please discard Corporate Bulletin Number 04-06-04-003 (Section 06 -
Engine/Propulsion System).
This bulletin provides information on two different conditions.
Condition 1
Some customers may comment that their vehicle is difficult to fill with fuel or when filling, the pump continuously shuts off before the tank is full.
Cause
This condition may be caused by the variability (fuel flow rates, type of fuel fill nozzle, fuel properties) at the filling stations. There is a potential to
develop an increase in back pressures internal to the fuel fill neck. This back pressure trips the fuel nozzle prior to filling the tank, or results in a hard to
fill condition.
Condition 2
Some customers may comment that when filling the fuel tank, a small amount of fuel may spit back/out.
Cause
This condition may be caused by the equalization of pressure between the fuel tank and the fuel fill neck that does not react quickly to the variance in the
pressure when the fueling station fuel nozzle trips off.
Correction
Replace the fuel tank filler upper pipe assembly with P/N 88983256 or P/N 15131043, and lower hose assembly with P/N 15131046. The new upper
pipe has been redesigned to provide smoother flow conditions within the section and the lower hose has been redesigned to include a checking feature.
Use the procedure listed below.
1.
Remove the fuel fill cap.
2.
Remove the fuel fill pipe housing.
