[Chuck W.]

Great write up Tony. Nicely done. The pump I sent you had about 28,000 miles on it. It was making a whining sound for a couple months before I replaced it. I had read the various threads regarding rebuilding it and some of the rebuild failures. Audi uses the same pump and they had posted some rebuilds too.

Bosch sells them new in the $300 range while the Porsche dealer sells them for $1700.

Then I looked at qualityporscheparts on eBay. They had (have) over 50 pumps for sale (Porsche Part No. 99660510400). Their prices vary depending on the mileage of the Porsche they came out of. I paid $65 for one with 49,000 miles on it. For me, it was worth the gamble of buying a used one for $65 verse trying a rebuild.

One thing I noted is the top comes off very easily by removing three compression nuts. Once removed you can see and remove the air filter. Both, mine with 28,000 miles on it and the donor one with 48,000 miles were filthy with fine black soot. When I cleaned the original one it ripped it. They are very fragile. When I cleaned the donor one I used Dawn dish-washing soap I was very careful and it came out well.