Details on HPFP Models and changes

[Mr. ///M3 RD]

As can be seen in WIKIPEDIA HERE under the Heading Problems

Quote ....

In at least the US market, the N54 engine has been characterized by a very large number of High Pressure Fuel Pump (HPFP) failures, leading to many BMW NA vehicle Lemon Law "buy backs" and reduced customer goodwill. On some engines the HPFP was replaced four times within the first few years of service.[citation needed] BMW has instituted a 10-year, 120,000-mile (190,000 km) warranty on the part, but only for 2007, 2008 and 2009 model year vehicles with the N54 engine. Other model years, to include 2009 models, continue to report HPFP failures.[2] As of late 2009, the low pressure fuel sensor has become suspected of causing some premature failures of the HPFP by engine tuners such as AMS and CP-E.

BMW tried to engineer a newer HPFP solution to eliminate HPFP issues users were having. The first 335/135s came out with 1351 7 537 320 HPFP followed shortly by 1351 7 585 655 HPFP and 2009 model had 1351 7 592 881 HPFP followed by 1351 7 596 123 HPFP. These pumps were updated and replaced again due to the high rate of failure with 1351 7 594 943 HPFP. But these also started to fail and got updated and replaced a couple of months ago (May 2010) with a brand new remanufactured pump 1351 7 613 933 HPFP [8]. On the 26th of October, 2010, BMW announced a recall of vehicles with the pump in question from manufacturing years 2007-2010[9].

...... End Quote

[Alext]

Perhaps the differences in the pumps could give us a clue to what the problem actually is. Anyone know what the exact differences are in all these models?

[Frank Costanza]

http://www.reuters.com/article/idUSTRE69P3MB20101026

That's the source cited. Wonder if I should take our car in.

[Mr. ///M3 RD]

Originally Posted by Alext

Perhaps the differences in the pumps could give us a clue to what the problem actually is. Anyone know what the exact differences are in all these models?

your question is a good one, however, I suspect that only BMW can respond to that.

It would be nice if some friendly BMW Service Manager or even the VP of Engineering Tom B. would get on one of the forums and give us an explanation like ......

A) We isolated the model and are replacing the faulty ones.

or

B) We know where the pump was made and no longer use this vendor.

or

C) We don't know yet still trying to isolate and/or analyze the failure mode.

Whatever some one from BMW will tell us, please don't tell us it is bad gas or sucking gas from the bottom of the tank at a gas station or even that dirty particles have passed thru the filters. Give us a break and tell us something. Because if that is all they can tell us then they should not be working for BMW designing fine cars, they should be working for Walmart as a Customer Welcoming Person if that would be there best answer for us. Surly a good BMW hydraulics Engineer made sure that the aforementioned could never ever happen to such a fine driving machine. After-all, what JOY would that be?

Mr. Tom B. Don't worry about us skipping or delaying our vacations we shall take a plane and rent an American car.