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If it is a vertical black plastic looking thing with plastic hoses going to it it is the carbon canister ( pollution device). IF it is laying on its side with a steel flare fitting on it running along the frame near the front of the rear wheel its is the fuel filter( not always black though?)

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18y ago
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Q: What is the round black thing on the drivers side under the rocker panel by the gas cap of a 91 Buick Regal that has 2 lines running from it?
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