My 08 has 209k on it and mine is starting to show signs of failure.
Another members thread described similar issues with 230k.
Not an exact number but many other seem to be north of 180k when they do a replacement.
PN for the 4th gen is 7702035112
__________________ 08 V6; Dobinsons IMS, Spidertrax, Prinsu, Revo 3s, AFE pro dry, Mishimoto catch, JBA shorties, Custom Y pipe, Borla pro XS, Hayden trans cooler, Ultragauge, Fumoto, +More..
I replaced mine at 220,000 preventively. Its better to do it when you have time than when you get stranded
__________________ 2007 4Runner Sport 4WD 4.0L 228,000 miles The real stats on gun murders in America compared to the world (link)
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My fuel sender failed (gas gauge was all over the place) at 180k miles. There was no way I was only replacing the fuel sender if I had to drop the gas tank, so I replaced the sender and the fuel pump.
Make sure you replace the filter as well if you do it, and use a Denso (OEM) filter.