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Okay, so the 3rd generation pump, the one you want is:
1 13-51-7-592-881
The older generation ones are:
1 13-51-7-585-655 RMFD HIGH-PRESSURE PUMP:135019
1 13-53-7-537-320
Now here is the catch:
If you have a 1st generation fuel pump and older software, the pump will fail prematurely. The MIL light should appear and the car should enter limp mode where it is completely depleted of power, no turbo boost, etc.
However, if you have the 2nd generational fuel pump and more recent software (v27.xx CIP of later) and fuel pumps start to lose pressure the software will detect that fuel demands can not be meet and cut throttle position (In short, you loss power and boost). This minimizes limp mode and in some cases you can lose a lot power and still not trigger limp mode.
The latter is really nasty as the car may feel sluggish, but not so bad as to tip you off to the problem. This is basically a software workaround to try and keep the car working as long as possible on a faulty pump. BMW came up with this software fix to mitigate the problem rather than fixing it as, at the time, the 3rd generation pumps were not yet available.
How to check:
1. Locate the supplier's identification and production numbers. If the number from the top line consists of any four digits, a forward slash symbol (/), and the numbers 07 or 08 at the end, then the HDP pump is defective and should not be used.
2. If the number from the top line consists of any five digits, then proceed with further inspection. Locate the production date and if the numbers are:
08051
08053
08071
08072
08073
08078
08080
Then the HDP pump is defective.
How to tell if your fuel pump is failing:
The most common failure mode would be the complaint of 'long cranking time of 4 to 5 seconds', or power reduction mode.
NB. When replacing the HPFP, the dealer must reset the DME Adaptions via computer.
Note that I would not recommend upgrading from software older than v27.xx unless you have verified that the HPFP is a 3rd gen unit, or, you risk the situation where you car is effectively de-tuned to keep the pump going as long as possible, allowing BMW to avoid replacing it and leaving you with a potentially underpowered car that suffers from turbo lag and other annoying characteristics.
If you have a 3rd gen HPFP, then upgrade may be a consideration. In this case, go to the very latest. (See the N54 engine forum for info). Honestly, I wouldn't rush to upgrade. The new software is full of workarounds for problems rather than fixes. From what I've heard, it doesn't add any functionality that will improve the ownership experience.
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