This problem is caused by a defective fuel gauge sending unit, it is located in the gas tank.
This is a pretty common issue for Trailblazers to have. Here's a link with more information about these GM gauge problems. And where you can purchase replacement parts on Amazon if you'd like to repair it yourself.
How To Repair My Instrument Cluster
2005 Trailblazer EXT V8- Just filled up my gas tank and its reading empty
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