There is a campaign on a tank problem.
here is the info on it
Special Coverage Adjustment - Fuel Tank Inlet Check Valve Fracture
# XXXXX - (08/24/2007) Models:
2002-2004 CHEVROLET TRAILBLAZER EXT
2002-2004 GMC ENVOY XL
2004 GMC ENVOY XUV
This bulletin contains a revised service procedure and claim information. Discard all copies of bulletin 07099, dated June 2007.
Some customers of 2002-2004 Chevrolet TrailBlazer EXT and GMC Envoy XL, and 2004 GMC Envoy XUV vehicles may comment on an SES light illumination, which may be accompanied by a fuel odor, and/or a few drops of fuel on the ground when refueling the vehicle. This may be caused by a fracture of a weld on the fuel tank inlet check valve (ICV). The ICV is located above the full fuel level. A fracture in this area may allow fuel vapors to pass through and allow droplets of fuel to accumulate on the side of the fuel tank as it passes over the fracture during refueling.
Special Coverage Adjustment
This special coverage covers the condition described above for a period of 10 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. The repairs will be made at no charge to the customer.
For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after June 8, 2007, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to June 8, 2007, must be submitted to the Service Contract provider.