Am here fighting this code too... it's what's brought me here (and 80000 miles - 50000 of them mine). Am well beyond the cap, but only have replaced it once.. about to start there again.
In short, is there any info on the TJ EVAP system? I've now traced it to literally EVERY corner of my beast! Havn't dropped the tank, yet... but getting there too.
General info tho... I also found a loose hose end by the gas filler tube that has a cap on it. There's another tube that connects into filler tube, but this plastic one doesn't. The little rubber cap was extremely loose... replaced it.
Having a hellva'time finding these 90'corner vacuum hoses... who has them?
Thanks (I'll stop at that with this note!)