After about a week of my gas gauge sticking around half a tank, I've got the P0455 check engine light and searching the forum didnt turn much up on possible causes/solutions. I know its an EVAP problem and I cant fill my gas tank easily. Every 1/4 of a gallon, the gas nozzle does its "gas tank full shut off" and I have to wait a little bit to try again. So it seems that it could be the canister not letting me replace the fumes in the gas tank with gas. Any one else have this problem or could possibly shed some light on this for me?

EDIT: Really? Nearly 100 read this and nothing? Im just trying to find out where to start looking for problems or what is the most common cause for this error. Im sure Im not the first to have this.