Now you got me! I know nothing about the 4 cylinder TJ engines. Fill out your Jeep Profile with what is on your Jeep. You may get more help from people if they know what your rig is equiped with.
As far as my Jeep problem, It was an EVAP connector that just outside of the top front driver's side corner of the gas tank. I was lucky. I did not have to drop the tank. There are some more connections on top of it. I had just put it back in after installing a new gas tank skid.
On my '04, the EVAP canister is in the back pass. corner of the tub. Older TJ's have them up front in the engine compartment somewhere. On yours? IDK.
Your problem may have nothing to do with EVAP. Do you have any kind of body lift? Check all your fuel line connects too. Is your fill nozzle connections nice and tight? Just throwing out some more ideas.