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The black plastic thing is a vapour condensor canister, they're on all the 80s Aus Alfas I've seen. Should be a line going forward from the top right corner to the inlet side cam cover breather, and a line from the bottom down into the fuel tank, and a vapour line from the fuel filler neck to the left top side of the box. The top right line has a one-way valve in it which gets gummed up over the years - pull it out and make sure it's not stuck. If it's stuck it will give you a fuel smell, generally through minor cracks or leaks in the line from the cam cover.
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