Join Date: Mar 2009
Location: Interior Alaska
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Most are vents or go to the evap canister that was in the rear corner panel. You can block them all off and run the tank without worry. This is provided the vent line that is next to the fill line (3/4" diameter IIRC) is still connected.
The stock repair manual (~$80 from binderbooks.com) will have the exact detail you need. Or do a search over at Binderplanet. It's been posted up there several times.