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wtf is this black box?

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Old 09-01-2011, 11:51 AM
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Default wtf is this black box?

Looking to get a quote on my exhaust and while getting my catalytic converter replaced, i noticed a black box under the driver rear quarter panel back near the bumper on my 97 Jimmy 4x4 4 door. Wtf is this? Fuel pump?
 
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Old 09-01-2011, 12:04 PM
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EVAP canister.
 
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Old 09-01-2011, 12:16 PM
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What exactly is its purpose? Does it affect anything if it is bad?
 
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Old 09-01-2011, 11:41 PM
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I think it keeps gas vapors from entering the air.
 
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