Yeah, the cannister is in the rear of the car.
The EVAP purge solenoid is mounted on the
drivers' side of the intake and has a line
running to the front of the intake.
BTW I broke the fitting on the discharge
side of the purge solenoid and got no codes
in the 2 days before I could get another.
(probably leaned out the engine pretty
good, though).

 

If you still can't find a problem and the gas cap is known good, take it to a local mechanic shop and have them put a smoke machine on it. It will pressurize the evap system and blow the smoke out the leaks making them easy to spot/fix.

Rob (Bad30th)

 

i had the same issue, i got a gas cap, still got the code, then i got a new purge valve and line and havent seen the code yet but it still may come up. its been happening to me ever since i cleaned the engine bay and i think i got water in that damn valve causing it to maybe stick sometimes, i dont know, it was 35 bucks to replace