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Both 99 and 00 XJs have a fuel filter/regulator on top of the fuel pump, p/n 4798301. I just went through Chrysler's system and didn't find any mention of changes to the fuel system. No parts nastygrams, no tech tips, nada. Can you get a part number from your friend, kir_kenix? I'm curious. Every shop has its little tricks to fix problems that they see but the factory doesn't. It looks like the factory doesn't see an issue here (they might, but that would take a lot of digging during the week), so this looks like one of those local fixes.
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