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Is it possible to overfill a gas tank?

So basically I went to get gas this morning before class at a new seven-eleven that had just opened up right across my campus. They were having an opening special where if you bought a car wash you got 10 cents off per gallon of gas. I gladly decided to do this as my car was running on empty and I needed a car wash. It usually cost me $60 to fill up my 17 gallon tank when prices are around $3:50. With the discount it came to about $3:19 a gallon so I put $50 in at my pump and proceeced to fill it up. Around $46-47 my gas tank was full. I had already paid the $50 for gas so I wanted my money's worth and pumped out the last few dollars of gas in so I basically got an extra gallon of gas. Will this cause problems at all or is this nothing to worry about?

As for my car it's a 2002 Toyota 4-Runner with over 150,000 miles on it.

Thanks for any replies :)

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Nothing at all to worry about. Only worry you have is, when is gas going to rise sky high again? Enjoy these lower gas prices.

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Mmm they tell you not to top it off but I don't think it's that big of a deal if you only do it once

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Well that's good to know, Do you perhaps know what problems could happen if I were to do it again?
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When you have your truck on for a while, the gas might heat up, causing to to expand and leak out of the gas tank.
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Ok thanks, luckily I only travel short distances at a time so that shouldn't be a problem :)
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Yes

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As long as gas didn't start leaking out from overfilling then you're fine.

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You should be fine

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Topping off your gas tank is of no consequence in my experience of about 16 years driving. I can't imagine why anyone would warn against it except as prevention against overflowing the tank. "Full" when it comes to the gas tank is a bit relative, anyway. We have a 22 gallon tank, yet have never been able to put more than about 20 gallons in it. It must be an expansion thing...

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Usually the car companies don't want you overfilling your gas tank is because raw fuel may enter the emission vapor lines at the top of the tank and may damage the charcoal canister.

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Your good man.. You will know when you over fill it! Still though it'll run out till it stops put the cap and go..

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