The other poster is right if it was left with fuel in it the fuel pickup is probably plugged. On this lantern the pickup is called a "Fuel Air Tube".
To test if its really plugged pull the generator (thats the brass tube with a nut on the bottom that runs up between the mantles and open the valve (do this outside, we expect fuel to come out). Fuel should POUR, or maybe even shoot out at that point. If it doesn't you've definitely got plug down below. If you do: drain the fuel out, put in some carb cleaner or fuel system cleaner, pump it back up and open the valve to let some of the fuel system cleaner into the FA tube, then close the valve and wait a few days. Open the valve again and see if you're getting more.
If you don't have a blockage you might have something in the air tube (thats the larger tube behind the generator) or the burner tubes (the things the mantles tie to). Or maybe you're expecting something other than what really happens, when lighting the generator will kind of gurgle or sputter to indicate theres fuel present. You don't want liquid fuel coming out of the generator's gas tip, that would give you a big fireball when you tried to light the lantern...
It's likely that it was left away with fuel in it. This causes gel to form which blocks the fuel getting through. The blockage could be anywhere between the tank and the mantles. The order I would check in are;
It's possible to get these parts from coleman or coleman suppliers. To find which needs replacing you'd need access to another similar lantern and try replacing one at a time. Otherwise it's going to be trial and error or just replace all.
There's a manual which shows the assembly and the order number for parts at http://www.coleman.com/coleman/images/pdf/220f_228F.pdf
I hope this is of some help.
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