Ewww. A GROSS leak. It means you have gross stuff leaking out of your libby.
Seriously, I would bet my next paycheck that it is a small piece of rubber line that has split open above and in front of the gas tank. Do a search for that code number and you will see some photos of what I'm talking about. These lines run to the black plastic canister back there. It is an evap cannister I think. Anyway, it'll take about $5 to fix it AND relocate the rear diff breather tube while you are under there.
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2003 Liberty Sport 4X4
DIY Frankie Lift, BBS Rims, Aussie Locker Rear, DTT Front, Renegade Rack & Light Bar, Custom Front Bumper w/ Warn XD9000i, Custom Rear Bumper, JBA UCA's, Full Skids(Mopar, Kilby and Super skid), CRS Rock Rails, CB, EVIC, Nav, power dim mirror, (2) 8" subs under front seats.
http://www.cardomain.com/ride/2512777