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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