Evap system? Are you using an aftermarket gas cap, or is your original one damaged or just plain old old?I've noticed the CEL goes off shortly after I fill the gas tank up. What does it mean when you fill the vehicle and the CEL goes off?
Sometimes a new OEM gas cap is all it takes.
That said, you are clicking it at least 3 or 4 times, right?
Also, evap purge solenoid, if the above doesn't do it.