Other Fuel System Hoses Lines/piping, And Fittings problems of the 2006 Chevrolet Trailblazer

I herewith request that NHTSA opens an investigation into the performance/reliability of the fuel level sensor installed in model year 2006 Chevrolet Trailblazer vehicles. In case the fuel tank level sensor is or becomes defective it could result in a subject vehicle running out of fuel, stall, and being rear ended by another vehicle. The currently owned Chevrolet Trailblazer 2006 has already the third fuel sensor. The first replacement took place when the vehicle was 6 months old, the second replacement took place in spring 2010. Gm customer service and the Chevrolet repair shop denied a malfunction of the involved fuel sensor. I am still in possession of the third (old) sensor. Complaints to adelco, the supplier of the fuel sensor did not lead to an result either. Never received a satisfying answer from gm nor from adelco. In the internet I found multiple complaints from other Trailblazer owners regarding the fuel sensor. Since my vehicle has the fourth fuel sensor I do have problems again (fuel cap not properly closed warning light comes on sometimes, engine/emission failure light comes on sometimes). Gm customer service in detroit told me to go tomy local chevy dealer and ask them to review the problem and estimate the cost. I was told they would afterwards make a decision to reimburse me for the cost. After the repair service gm and the dealer declined the reimbursement request and claimed the part failed because of the high mileage. The replaced sensor was for only 40000 miles in the vehicle. The second fuel sensor was installed before I purchased the car from a gm dealer (was never told about that problem).