Charcoal Canister Problem on 2006 Xa..Help!

[kansascion]

I have a 2006 xa that I had the check engine light come on in January. I took it in to toyota and they said it had a cracked charcoal canister on fuel tank. After they fixed it the light came on again and this time time they said water was getting into canister and Toyota was working on fix. I have had the light come on 3 or 4 times and everytime I'm supposed to take to Toyota to reset...and each time they say they are still working on fix...and to keep on bringing in my scion to have light reset.
Has anyone heard or experienced this problem? It seems to me that others would be having the same problem on their xa's. I am just getting suspicious of a run-around by toyota...Please help.
thanks