valve between gas tank and overflow hole next to gas filler hole

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oldskull

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Joined
Jul 18, 2009
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I just failed smog for fuel evap system leak on my 91 fleetwood flair with a 454 and I found a valve behind the gas tank that is linked to the 1/2" diameter hole right nest to the gas cap.  Does anyone know what it is called?
 
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