I finally completed the reconstruction of my Cherokee; it's been a year and I first drove it three days ago! I've noticed a rather odd noise coming from the fuel tank area: gurgling. I can only hear it when the Jeep is off, but engine noise would prohibit me from checking with the vehicle running (it's a very faint "gurgle"). I can only surmise that there's some type of fuel vapor purge going on, but why, and why all the time? There is no audible pressure in the gas tank when I remove the cap, either.