I'm not sure what this line is...can someone help?

It sits on top of the rear axle - the rubber line goes straight up from there to a clip near the top of the fuel tank (it has rotted off and is disconnected from in this picture):



it runs straight up to nowhere? I'm bending it down in this picture. this is looking from under the jeep to the top of the fuel tank:



the end of the line is plugged with this:



what's its purpose? it's also cracked and rotted on the other end.

thanks

That's the breather tube.

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2003 KJ Renegade, 5 speed, frankenlifted,Al's a Arms 4.5,Moabs 245/75/16 BFG KM2's, custom rock rails, full Mopar skids, Hella ff220 lights,Hd cooling,Front DTT,Riddler diff cover,Rola safari rack,Cobra 29 peaked & tuned.

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It's pretty important that you replace that before any water gets in the diff, which can cause a failure. I just did it on my KK. Get some 5/16" low pressure fuel line from your local auto parts shop and your good to go. If you ever wheel it I'd get about 5-6' for the rear axle, if you stay on road you should be ok with 3'. Keep that top part and reuse it in the new hose.

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2008 Jeep Liberty KK, SkySlider, Tow Package, OME/Bilstein Lift, Flowmaster Delta 50, Removed Resonator, DuraTracs, In-dash CB, PIAA 520 ATPs, Dual KJ Tow Hooks
http://www.cardomain.com/ride/3974106/2008-jeep-liberty
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thanks guys, i appreciate it.

went down to the auto parts store and just replaced it.