Quote:
Originally Posted by Halm
Pretty sure that when they went from twin turbo to single turbo, they also changed HPFP and the problem went away. In 4 years and 60,000+ miles, I never had a single issue.
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Doing a very quick forum search, it seems that they tried a couple different pump options before they figured out the real problem which was the pumps weren't priming correctly or long enough before starting the car.
Apparently a software update back in 2012-2013 fixed the issue for 99% of the N54/55 engines and the problem never was the pumps themselves after all.