I have a 2000 Buick Lesabre Limited and the gas gauge shows full then 3/4 of

John

New member
tank then it goes to 1/4 of tank? My gas gauge bounces all over the place then stays at 3/4 full dropping to 1/2 and then full when there is only a 1/4 tank left. What is going on? is it the gauge or the sending unit?
 
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