Quote:
Originally Posted by Rafale
How do you know? It seems to be the only logical explanation if the failure rate in Europe is really lower that is. What else could be so different that it would make the US pumps fail so frequently?
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First - part of the rumor is that fewer HPFP fail in Europe but if you do a poll on any given day, and there have been a couple informal ones, member of the forum are aware of HPFP failures in Europe, too.
Second - except for racing fuel, fuel quality differences are a myth. Individual brands' fuel is produced the same and even stored in the same containers but the individual brands' additives are put into the fuel just before delivery. US has ethanol, but if that was the problem then it would be affecting other fuel pumps as well - see points Three and Four.
Third - A low pressure fuel pump, high pressure fuel pump, mechanical fuel pump, electric fuel pump, etc. are all made with the same metal, the same seal materials, etc. If the fuel is the problem then why isn't it destroying all the fuel pumps? Additionally, the Volkswagen's big 10 marques (including Porsche), and BMW and few others Euro manufactures get their pumps from the same companies. Why aren't they all failing here in the US?
Fourth - Although a number of manufactures are having issues with HPFP in lower numbers, why aren't BMWs other HPFPs having the same issues in the same numbers. Example - BMW makes a nice tt v8 first installed in the X6 50i with a HPFP - go over there and monitor their threads to find out if their HPFP are failing at the same rate. I can tell you they've had some failures but not a high rate.
Fifth - the new n55 has a HPFP. Are they failing at the same rate? Time will tell. It appears IMHO the n54 HPFP has a design defect that apparently cannot be easily corrected.
Update:
Note the latest info from Alext:
Quote:
Originally Posted by Alext
Note that the new N55 twinscroll engines (designed to replace the N54) also use the same HPFP with the same part#. Some have failed already too.
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