One problem related to tank filler pipe and cap has been reported for the 2005 Chevrolet Trailblazer. The most recently reported issues are listed below.
I purchased a 2005 chevy Trailblazer in March 2005, since than the following items has been replaced, just to name a few: fuel tank level sensor (33,104 miles), ho@ sensor shorted (20,205 miles), bearing in idler pulley (25,233 miles), idler pulley bearing failure (47,500 miles), internal clutch circuit (33,896 miles), fuel cap replaced three times, replaced water pump (63,911 miles), air pump relay (77,000 miles). The light unit has been replaced, I was driving and the lights on the radio, doors and other items went out. The vehicle currently has 80,000 miles and I have to replace the fuel tank level sensor again. I have been attempting to get GMC to recall the vehicles, because of the danger involved with the sensor unit sending the wrong signal, meaning the tank could be within a half of a gallon from being empty, but the fuel gauge is reading full. It appears that gm is waiting for multiple deaths to occur before they consider this as being an item that could cause the death of several motorists.