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Old 11-12-2009, 05:41 PM
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450slcguy 450slcguy is offline
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Join Date: Jan 2006
Location: USA
Posts: 613
Charcoal Canister

1980 450SLC

I was toying around(painted) with my charcoal canister the other day and noticed that the bottom has what appears to be breather holes. Thinking that this should be a closed unit I blocked the intake port and applied vacuum to the other port. Appears to breath out the of bottom. There is a vacuum line from goes to the air sensor that sucks up fumes to burn them off. I smell no gas fumes when parked in the garage. The canister is in good shape(no visible rust), but I'm wondering why it would have a breather vent in the bottom of it.

My question is: Should the charcoal canister hold vacuum?

Thanks
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