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Before changing any gas caps. Why don't you try using a fuel injector cleaner. Get a real big / or the bigger fuel injector cleaner you can buy and pour it in on your next fill up. I bet after the next fill up or two everything will be ok. I had the same problem on mines. The only way to check, if your cap is bad go to a local state inspection shop and they will check it for you for a small feed of course.

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Q: How can you tell if the gas cap or fuel is bad on a 1997 Ford Expedition when the check engine light comes on and AutoZone said a fuel valve is sticking?
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