There is usually a rubber coupling connecting the filler tube to the tank neck,. Check for the presence of the coupling and if there, for a crack or maybe it is partially disconnected. There may also be a vent tube from the upper part of the neck back to the tank for vapors the exit the tank during fueling. If the vent is damaged or disconnected, fuel can escape. If any of these things are an issue, it results in the fuel system being open to the atmosphere, and may result in a "check engine" light on.
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There is likely a rust hole, or puncture in the neck of the gas tank (the pipe leading from the tank to the gas nozzle). When you are filling the tank the gas runs through the pipe and leaks out of the neck. when you are done filling, all the gas is in the tank, and not high enough to come out of the hole. You can probably pull the cover off the inside of the wheel well, and see the leak. if your lucky, you will be able to patch the hole.
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This seems to be the same issue I am currently having with my 99 Camry. I filled up, then left the car sitting in the driveway for a couple days as i went camping. I just loaded up the car with bike stuff to go for a ride, and there is a pool of gas dripping from the rear. Haven't turned the car on for a few days, thought it was quite random. The car was on a very slight incline in the driveway. I'm not too savvy with cars so rushed it to the mechanic. I'll be sure to post once I hear what the issue is.
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