So my check engine light on my 3.4 liter 2005 Monte LS is on due to a "faulty vapor canister" where and what exactly is this. I see that the charcoal canister is on top of the gas tank. Is it the same thing? Or is it just under the hood. I can't seem to find this anywhere. I keep seeing them both in pictures when I type this in on google or look for videos. Thanks again guys