Depends on where ya live and how rusty it is.
Make sure it's the pump and not a fuse or relay or somthin.
You may have allready checked it I appologize don't be mad if I insulted you inteligence. Job isn't bad if the tank is empty, It usually involves a jack and a make shift platform for the jack to lower the tank some swearing at the filler tube and fuelines an extra person to help swear with you I havn't done a Jeep but I've dropped quite a few tanks in other Vehicles, Disconnect the Battery,
Get a book on the truck some autostores here in Michigan carry a program called "All Data" The guys here will usually print up what it takes to do a project.
If you got the tools and detrmination it's just another notch on the belt for fixin stuff on a car.

Good luck!!