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      09-23-2007, 09:22 PM   #23
inTgr8r
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Quote:
Originally Posted by midlife View Post
...
.
my guess is that:
1/ BMW still has the older siemens pumps in stock
maybe they are still using these siemens pumps as replacement pumps
2/ I AM HOPING that all new cars with N54 motors have the new BOSH pump.

anyone out there no for sure of any of my speculations?
They would not keep them in the pipeline...
they'd be spoon feeding them to Siemens. (if they were at fault)
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      09-24-2007, 09:45 PM   #24
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Quote:
Originally Posted by inTgr8r View Post
They would not keep them in the pipeline...
they'd be spoon feeding them to Siemens. (if they were at fault)
that definitely would b the right thing to do.
my fingers are crossed as to what BMW actually does. :iono:
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      09-25-2007, 01:08 AM   #25
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are the HPFP an in tank unit or out?
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      09-25-2007, 02:45 AM   #26
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Quote:
Originally Posted by midlife View Post
that definitely would b the right thing to do.
my fingers are crossed as to what BMW actually does. :iono:
I won't lose any sleep over it.

Quote:
Originally Posted by ichiban
are the HPFP an in tank unit or out?
IIRC it is located near the fuel rail in the engine bay. It is more efficient that way.
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      10-06-2007, 12:22 AM   #27
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as of september bmw has released a new updated part number for high pressure fuel pumps.

a few cars at our dealer have had pumps replaced twice. the replaced pumps were no better than the original pumps. hopefully the new part number wil solve the pump issue.

the hpfp is located underneath the intake manifold and is driven by the vacuum pump which is driven by the main timing chain.

as of now the only vehicles in bmw's lineup that use direct injection and therefore a high pressure pump are the n54 biturbo engine and the n73 V12 found in the 760Li/i.

hope that helps.
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      10-06-2007, 02:30 AM   #28
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Quote:
Originally Posted by zba857 View Post
IIRC it is located near the fuel rail in the engine bay. It is more efficient that way.
interesting. any diagrams? or pictures?
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      10-06-2007, 03:03 AM   #29
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Quote:
Originally Posted by bimmertech View Post
as of september bmw has released a new updated part number for high pressure fuel pumps.

a few cars at our dealer have had pumps replaced twice. the replaced pumps were no better than the original pumps. hopefully the new part number wil solve the pump issue.
my dealer, sounding like he knew what he was talking about, said it was not the pump per se that was the problem, rather, the seals weren't holding up. any truth to that?
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      10-06-2007, 12:27 PM   #30
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Welcome bimmertech!!

Quote:
Originally Posted by bimmertech View Post
high pressure pump are the n54 biturbo engine and the n73 V12 found in the 760Li/i.

hope that helps.
Is their any cross compatibility between any of their fuel system components? Is the 760 coming in for HPFP failures?
Thanks and welcome!

Quote:
Originally Posted by ichiban
interesting. any diagrams? or pictures?


edit: Blue=fuel Red=oil fill
Quote:
Originally Posted by kurichan
my dealer, sounding like he knew what he was talking about, said it was not the pump per se that was the problem, rather, the seals weren't holding up. any truth to that?
That makes the most sense.
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      10-06-2007, 03:09 PM   #31
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swt, thx for the diagrams.
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      10-07-2007, 12:14 AM   #32
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the updated bulletin says the internal seals of the new pump have been improved. and there is no cross compatiblity of the fuel pumps in the n54 and the n73. the systems and the way they work are completely different.
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