gas tank on 2000 Chevrolet Impala

i'm having problem with my gas tank sometimes when i put gas in my car it will not take gas. it won't take it like car is full but its not. i have to wait til my car can take the gas before i put some in it what could it be

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2 answers
I just looked up recalls for Chevy Impala and there was some recalls. you might would want to check it out. They also have contact numbers.
there is a vent soloniod that should be normally open with the car off so the air can escape when fueling. take it to a pro and have them check and see if it is a problem.

Roy