What year is your Jeep?
If fuel injected, try turning the key on for a few seconds before cranking the engine. Do this twice and then start the engine. If it fires right up then it's your fuel pressure regulator allowing the lines to backflow into the tank. The regulator is attached to the fuel pump, inside of the tank.
1998 Wrangler Sport: 4.0 with a 5 speed, 2 1/2" spring lift, 33" Duratracs, Warn winch, and few other things.