I agree with the responses posted above, but not sure I agree with carrying a spare feul pump. '97-01 cherokees have the pump in the tank and it is fairly expensive ($2-300) and is also delicate so you'd have to keep it in the box which is good sized (from memory - 8"x8"x15").
While I agree spare parts are good, a feul pump on these models is not an easy roadside fix. Drop the tank, hope the pump went out when it was near empty. Mine had 3/4 of a tank and it nearly killed me to get it down. To me, this is when you actually use AAA or some other roadside assistance to get you off the road and back to a place where you can do the work, or have someone do it. Through my insurance company I pay about $8 a year for roadside assistance.
A better bet if you are really paranoid about a fuel pump going bad is some rubber hose, hose clamps, small electric fuel pump and some wire.
Troy