Depending on which bolts you undid the skid plate drops with the tank, like someone else said, you should disconnect the exhaust hanger so you can move the tank to one side to clear the frame on the drivers side. I soaked the nuts and bolts with WD-40 a few days before I dropped mine, came right down. The lines should be long enough to drop it a foot or so so you can disconnect the fuel lines etc.
In answer to rd-wrangler, you gotta drop the tank.
2013 WRANGLER SPORT 2 DR., V-6 ,AUTO,HARD TOP
)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights