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2008 Impala, 3.5 engine. After returning home, I added gas to the Impala's tank, and noticed that the gas cap has a rubber gasket that appears worn, which could be a possible cause of the occasional P0455 code. The gasket goes against the filler tube. A quick online search didn't return anything about the gasket alone. Is it possible to just replace the gasket, and if so, where would I find one aftermarket? Napa, O'Reilly and CarQuest are in this town, and Advance, AutoZone and A-Line are about 25 miles away.
 

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That's what I've so far seen. If the gasket can be found separately, I'd rather do that, as the gas cap is over $20 everywhere I've looked.
 

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Try a junkyard..
 

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Thanks. Stant is pretty good brand. And junkyards are also a good idea, I've just not been to one for a while. The gasket might be in better shape in a Michigan junkyard than here, as they tend to dry out in the Texas heat.
 

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Stant is probably the OEM for the cap.
 
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