yea this sucks, have had these dtcs for about 6 month and the will not go away. i have checked the gas cap.

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2002 KJ LIMITED 4X4
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RIP 1990 WAGONEER 360 4X4
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RIP 1990 XJ PIONEER 4X4

Start checking vacuum hoses from the gas tank to the engine.

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2002 Jeep KJ Sport 3.7L 4x4

245/75-16 Mastercraft Courser HSX, 16x7 Cragar, 2" OME MD Lift, ARB Bumper
AEM Brute Force Cold Air Intake, Flowmaster Super 44 Muffler

Currently working on: Full service on transmission & bed-lining ARB bumper

viewtopic.php?f=43&t=84650

You need to check the evap hoses under the back of your KJ,from the evap canister(the black box looking container in front of the gas tank) to the leak detection pump.Then check the lines running from there to the evap solinoid mounted right next to the battery,look for lines that have a green cap on it.Lastly you may need to have a smoke test done.