Well took my Jeep in today to have some work done, valve cover gasket, fuel pump tank gasket, front and rear differential fluids, got valve cover gasket replaced, but the one I had didn't fit? Had to order another one, apirently there is a slightly different design in the 4.0 heads in newer models than older ones. Well that was fixed with no problems finally. Then the diffrential fluids were changed and cases cleaned out. The old fluid looked so bad and dirty we surmise that it could have been the original fluids when my Jeep was new! Also the fuel pump gasket was ripped and the band was so loose I was able to turn it by my fingers! My mechanic friend said that someone had been in the tank before and didn't put the band on correctly, he also told me that my fuel pump had been changed before with one from the junk yard. So who ever did replace it didn't do it right. It took him 3 hours to do all the work. But right now I'm having hesatation and had a backfire coming home, I'm wondering it is hesatating because the fuel pump was out of the gas or what? The next thing I want to do once I get more money is have the transmission fluid and filter changed later this summer. But first the hesatation I need corrected. I have 271900 miles on my Jeep.