Have random growling noise in rear of car. Fuel gauge past F, can barely add gas

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Car has about 170,000 miles. Has a random growling sound in the rear that lasts around 6 seconds every time. Nothing is consistent about it. Can't make it happen either. More frequent since gas gauge stuck past Full and can't add gas unless I do it in small amounts very slowly. Growling started a few months before gas problem. Gas pump shuts off like tank is full at less than 1 gallon, but it's definitely not. Takes about 10min just to get 3 gal. Maybe a coincidence but I think it might be connected. Think the vent or charcoal canister might be causing the gas tank issue. No idea on the growling tho. Any ideas??