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I have had at least 5 customers, Grand Cherokees with that code , for evap leak. There are 2 hoses or 3 hoses going from the gas tank to the evap canister, located behind the drivers rear wheel. 2 of the hoses dry rot and crack. If you can get up in there with a small mirror you can see the hoses being cracked where they go over the barb on the lines. Just replace both hose, not to easy to get at.
1st vehicle that I did, I only replaced the cracked line that I 1st saw . It came back a week later with the same code. I did a little better searching with a small, retactable mirror. Then I saw small cracks in the other hose. Now I just replace both hoses everytime, that I find 1 cracked.

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