Thanks Fellas, yeah I was wondering the same thing myself. Here's a pic of the tank, and the part number on the side of it. I Googled the part number and it seems to line up with tanks for '03-'04 TJs.
I haven't dropped my own tank yet ('04) but I assume it has either the ball or plunger set up that most people have talked about on this thread so far.
The plunger set up on this tank in the photo seemed to have smooth sliding action, fwiw. I'm wondering if I should just install as-is and see what happens? Guess I can't make things any worse?
Also, not sure if it's related but I have been throwing EVAP error codes for small and large leaks over the same time frame as the fuel fill issues, starting after the lift install. I had my local shop smoke the EVAP system, replace the charcoal canister and solenoid - none of which solved the error codes or fuel fill issues. I am wondering if it's related to the plunger being stuck in the 'open' or 'half open' position?
Had a guy tell me that the way you know your TJ is running is if the check engine light is on. I'm starting to think he's right...
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