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Q: gas gauge problem on 2007 Buick Rainier

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
gas gauge drops off to empty after only four or five gallons are used. when you fill it up it reads full again until 4 or 5 gallons are used. it started doing this at about 51,000 miles.
(1) Answer
Most likely your sending unit is going out, to correct this you will probably be replacing the fuel pump assembly.