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Q: Gas gage stays on full while car is running on 2000 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I keep my car on a full tank of gas because not know how much gas I have.I set my trip miles to 0 after each fill up and around 100 miles I refill tank,well I went to 145 miles and the gage droped down to a half a tank and started working not sure if it was the right amound of gas doe but it was working. but when I put more gas in the same thing after 145 miles it start working again.well now the other day I had to take a long trip and filled up and about 45 minutes later the gas gage droped down to emty while driving 70 mph and a few minutes later shot back to full and the same thing on my way bach home.could this be a bad sending unit or in my dash board?

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