I had the same thing happen to me. No response from Toyota. But my son Googled it and found that when you press the Gas cap unlock from inside the car make sure that you hear two clicks. Because one click opens the outside body cover and the other opens a covers inside the pipe to let gas in. The slow flows and the flow back is because of the inside cover still being closed.
2018 Camery Hybrid - Fuel Blowback When Filling
in Camry Club
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I had the same thing happen to me. No response from Toyota. But my son Googled it and found that when you press the Gas cap unlock from inside the car make sure that you hear two clicks. Because one click opens the outside body cover and the other opens a covers inside the pipe to let gas in. The slow flows and the flow back is because of the inside cover still being closed.