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My '08 Cayenne started running bad one day and I was barely able to limp it home. I changed both pumps filters/reg in tanks as I always had a noisy fuel pump since i bought it. Well the new in tank fuel pumps did nothing. Car would start but not take any throttle under load. Ended up being my high pressure mechanical pump. Bought a new one on Ebay and that was the problem. Pain to change, but it sounds like you already changed it to no avail.... Sorry, I do not have any more knowledge other than after I changed it and was checking codes, I realized I could monitor fuel pressure on my scan tool and it was very high once replacing the pump (I can't recall how high, but I do remember being shocked at how high it was).
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
0% Liberal
Men do not quit playing because they get old.... They get old because they quit playing.
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