I believe I know the answer to this already, but is there any way or any source for individual Pierburg fuel injection parts? I seem to remember that the official answer when I got my Pierburg DL unit rebuilt was that Pierburg could not be contacted nor individual parts purchased, you were forced to go through Alpina who has only one option - rebuild.
My fuel pressure regulator has developed a leak. I have spares and have dissambled it and found a damaged diaphragm. If I could source a new diaphragm, I could reassemble and be on my way. I do not wish to wait months and spend thousands to send to Alpina for "a full rebuild".
Any assistance or leads appreciated.
Also, as it is a simple diaphragm, any thoughts or leads on material to make my own would also be appreciated.
I believe the situation is as follows:
- Pierburg have stopped making/supporting their old products (possible Pierburg no longer exists?)
- Alpina only have one old mechanic left who knows the Pierburg systems
- I vagually recall rumours that there was a company in Germany who bought all the old Pierburg inventory
I believe the situation is as follows:
- Pierburg have stopped making/supporting their old products (possible Pierburg no longer exists?)
- Alpina only have one old mechanic left who knows the Pierburg systems
- I vagually recall rumours that there was a company in Germany who bought all the old Pierburg inventory
Not exactly true on point 1.
Mike will recall that I had a similar problem to my regulator, back one year ago. I was ensured by Pierburg (they re-opened with a new owner) that they would rebuild my regulator. I worked it out through Alpina Belgium and Alpina Buchloe, and after about 2 months, I got the piece rebuilt and repainted as new, for a billl of approx 600€.
I had also issues with the main injection system, which was also sent over and rebuilt by Pierburg, whereas new injectors were made and calibrated by Bosch. The bills amounted to about 1600 € for the injection system, and 800 € for the new injectors +new wires.
I forgot about the cost, only the pleasure of a very well tuned engine remains (the engine now revs up to 6000 rpm like never before).
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1981 AlpinWhite B7 Turbo Coupé (#247)
1991 Sapphireblue B10 Bi-Turbo (#334)
1980 Aston Martin V8 Vantage
Not exactly true on point 1.
Mike will recall that I had a similar problem to my regulator, back one year ago. I was ensured by Pierburg (they re-opened with a new owner) that they would rebuild my regulator. I worked it out through Alpina Belgium and Alpina Buchloe, and after about 2 months, I got the piece rebuilt and repainted as new, for a billl of approx 600€.
You're right - Pierburg is re-opened: Kolbenschmidt Pierburg AG - Pierburg
I've spent some time just now digging and noone seems to have a contact at Pierburg.
Also, there seem to be no sources at all for spare parts - not even grey market.
If Alpina still has a contact then I guess that's the only way to try for spares.
The recurring advice from all the German owners is to ditch the Pierburg and to upgrade to the Motronic of the later B7 Turbos.
The recurring advice from all the German owners is to ditch the Pierburg and to upgrade to the Motronic of the later B7 Turbos
True Kees but this is for sure the very last option I would go for. Really if my car does not run anymore and others options have been exhausted. Reading Sherlock's comments on this, I see that he tried the Pierburg + Alpina way and has been totally sucessful
Agree the way he followed was the long / tough / expensive one, but his car still is 100% original and the pleasure to drive it as well
I'm sure you will subscribe to my point of view
Last edited by Yannick; 2nd November 2009 at 16:08.
Amen, Yannick! Ditching the Pierburg/etc will be a last resort, hopefully many years down the road (although I'm already figuring out how I could do it and still have the engine look stock - if I machine out my spare Pierburg unit and mount an MAF in there.....).
I think I've found my diaphragm material source. Should arrive by the end of the week. I should have enough to rebuild every regelventil out there worldwide. Plus, with the knowledge I've gained from disassembling/measuring/experimenting with the Pierburg spares I was able to pick up, I'm increasingly confident in my abilities to setup/adjust the things, too.
Sherlock: good to hear from you. I have meant to contact you ever since you posted about your success getting your car running and back home again. All is still working well?
Below are pics of the fuel pressure regulator (aka warm-up regulator and boost enrichment regulator). Assembled, exploded, and the offending diaphragms.
You can see one of the new reinforced nitrile ones I've cut, and the three originals. Note that they are no longer flat. The deformed anular ring on each diaphragm where it was under fuel pressure is a permanent and rock hard.
It's a wonder it worked at all. I'm betting this will turn out to be the source of my slight, untraceable underhood fuel smell. They were probably weeping for a long time before finally letting go. It was only a matter of time.
So far so good. No leaks, and pressures all set right back to spec.
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and the pleasure to drive it as well 
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