I've had an issue with my fuel pump on our LJ but it was a result of the wiring. At last years Ridgerunner Bald Eagle ExPo trip a stick or stone caught the wireloom along the frame rails and gave it a tug while motoring through a mudhole. The result was a shorting out fuse and no working fuel pump. A quick inspection and a wiggle of the pump wiring connector and all was good...for a year. At this years Hootenanny ExPo run I lost the fuel pump again, and like last year it was right in the middle of another mudhole We could not get it working and after a tow later we found out that last years incident resulted in two broken wires in the loom. They were not visible as the breaks were shield by the wire's sheathing. My local dealership found them by hooking up a fancy pants short finding thingy (how do you like that high tech description?). We spliced the wiring loom back with marine grade splices, used marine grade shrink wrap to seal them and then shrinked wrapped the hole loom as a whole. I might be possible that you have a short in your harness and your toasting your pumps. That or you just have bad luck.
