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Vapor/fume expansion tank. Plumbed to the fuel tank and then back to the charcoal filter in the engine bay.
I deleted mine with no adverse effects/smells though others may have different experiences.
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-Julian
1977 911 S: Backdate, EFI/ITB, AC project in the works:
http://forums.pelicanparts.com/porsche-911-technical-forum/1106768-when-well-enough-cant-left-alone-backdate-efi-itb-ac-more.html
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