Replaced both pumps, finally.... - Saab 900 Bulletin Board -

[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Performance | Detail | Clubs & SOC | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Service/Mechs | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

C900 Bulletin Board
1979-1993 & 94 Conv [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main C900 Bulletin Board | Post Followup | BBFAQ ] [ Prev by Date ] [ Next by Date ] Member Login / Signup [Latest Member Gallery Photos]
Replaced both pumps, finally....
Like This Post:
Posted by Name Left Blank (more from Name Left Blank) on Fri, 12 Jul 2019 21:07:08 Share Post by Email
In Reply to: Re: mine is also AC and has fine shredded metal traces, Landjet [Profile/Gallery] , Fri, 28 Jun 2019 19:48:08
Alert me when someone posts in this thread:

So, this took a while, but it's done and it is humming beautifully.

One question I had, which I may have answered, is if it's the pre-pump that generally is the bad pump. The car ran just fine due to the main Bosch pump, likely, but the noise was incredible.

Initially, I installed a hand-me-down used pre-pump. This pump was supposedly a "known good" but it was loose within the housing a little bit so I was suspecting something wasn't quite right. Upon removing the old pump, there was metal dust in both the tank and on the filter that connects to the bottom of the pre-pump. I think that's bad (ya think?), so I decided at least that was bad. Once installed, the used pre-pump sound was different but not exactly reassuring. I now had a hum that would change abruptly. Kind of a HUMMMMMMM, hum, hum, HUMMMMM oscillating. But at least it wasn't ratcheting. Still, I never had any stalling problems.

Finally, the new AC Delco (Made in UK) pump came and it was identical to the other two used pre-pumps and it fit exactly. By the way, at least from what I can tell, black wire goes to the left, white to the right, or that's how I see it on all the used pumps on the Internet. I decided at that point to just go full out and replace the main Bosch pump with the new one. With both new pumps installed, it hums beautifully with no oscillation and no ratcheting. I will keep the old Bosch main pump as a spare since I now think that what I have read elsewhere must be true: generally it is the pre-pump that should be suspect and a lot of the main Bosch pumps are needlessly replaced.

BTW, the correct pre-pump is AC Delco p/n 6441336 or at least it's identical to the pump I had and it fits. Some in this forum had mentioned that their pre-pumps were too long. The new pump is identical and still made in the UK and says AC Delco on it.

posted by 24.118.5...
Posts in this Thread:
Alert me when someone posts in this thread:

Post a Followup

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

Name: Member Login / Signup [Latest Member Gallery Photos]
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.


Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img][endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img][endimg] (or use the Optional Image Link field below).

Optional Link: (e.g.
Link Title: (Optional)
Optional Photo/Image Link: (e.g.
Photo/Image to Upload: [Member Only Feature] - Sign Up

The content on this site may not be republished without permission. Copyright © 1988-2020 - The Saab Network -
For usage guidelines, see the Mission and Purpose Page.
[Contact | Site Map | on Facebook | on Twitter | Shop Amazon via TSN | Site Donations]

This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. has been a moderated forum since 1988. For usage guidelines, see the Mission and Purpose Page. Please remember that you are not anonymous. Site Contact | Site Donations | Other Sites by SP -
Your address is: - Using CCBot/2.0 ( - Logged.

Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all the Site Membership Benefits!