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Answer (1 of 11): At least one poster warned of engine damage… pretty sure that isn’t a real concern. That said, the gas cap is an integral part of the emissions equipment, absolutely on anything post-1996/OBD-II. How long/far you can go before the check engine light comes on depends on the make

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What happens if my car's gas tank cover is left open for a long time while on a trip? - Quora