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7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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Old 05-27-2015, 02:03 PM
V12seven V12seven is offline
Registered User
Location: Hermosa Beach CA
Join Date: Jul 2013
Posts: 31
Mein Auto: 03 BMW 760Li
HPFP date & diaphragm question

I'm in the process of a minor overhaul, 94,000 miles on my 2003 and cleaning out the grunge on the intake valves and ports. I've replaced the diaphragm in the left side pump twice, 1st time was in the summer of 2013 and it lasted about a year. I did the same again and decided to take a look inside, it looks like its beginning to fail, so I'll be replacing it with the magnafuel 9400. Seeing as the engine is apart, I figured I'd take a look at the right side pump, it's never ben out. The sides of the pump look beaten up and it was difficult to read the serial #'s but a lot easier looking at the picture. It looks like I have a November 2007 on right side and January 2003, (original) on the left. My left had 2 diaphragms and the right has only one. It has been my thought all along that there is only supposed to be one and that if you have 2, it was a quick fix by the Stealer. I still had a factory warranty when I purchased and have a document relating to repairs to the problem pump. The repairs were done just prior to my purchase, so it looks shady. Also it looks like later model pumps have a brass bushing at the top of the pressure balancing spring, only one of my pumps has this.
For all of you that have done your own pump work, can you post pictures of the pump sides, date of your car and how many diaphragms you found. I think we could get a good picture of who's pump has been (fixed up), or replaced and maybe expose unscrupulous dealers.
I'm writing BMW regarding dealer supplied replacement diaphragms, however, I don't expect miracles.
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