Aww man ....... that is the WORST code there possibly is, unless you own a dealership. When that happens in this state, I just keep driving with a rejected sticker. Not worth the money or the aggravation to try to figure that one out. Like trying to find a needle in a haystack you can't reach.
EVAP is one of those systems forced upon automakers by the government that serves no purpose whatsoever, except to extort money from people who can least afford it. When was the last time you read of somebody dropping dead from a whiff of gasoline? Exactly. USELESS system.
There's people out there that HUFF the *censored*, & they still walk among us! Hey ... that could explain the number of Obama supporters!
One thing you can try that won't cost anything is to put some heavy bearing grease around the seal of your gas cap, just to rule that out. Or just replace it altogether. Might work, might not - main reason why I refuse any EVAP work. It's a frustrating crap shoot.
Head to the liquor store .... your gonna need it ....