Update on this
I had a problem with the fumes initially, and actually built my own charcoal canister with activated charcoal from a pet store. It seemed to work ok, but I was worried about getting enough airflow through it to feed the tank. I had looped some fuel line around to attach to this canister, and once I removed the canister I didn't really sense the smell as much anymore. It seems that looping some 2' or so of fuel line off of the vent tube has cut down the amount of fumes enough for me, and then I don't have to worry about the canister.
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