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isuras2
Joined: 17 Jun 2005
Posts: 458
Location: Phoenix, AZ
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 Posted: Fri Jun 15, 2007 1:06 pm Post subject: Fuel Pump Choice |
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I called SAP to get info on fuel pumps for my '80 924 NA. The internal is $75 and new OEM. The external is $190 and bolts right in. There is also the Piersburg #98154 which is $150. The guy said that one has different fittings that would need some work to make it fit. Anyone gotten the Piersburg and successfully gotten it connected? I was also looking for fuel pumps for a 1978 928. The fuel pumps for that are the same as those for my car.
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Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew |
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Tigger937
Joined: 11 Apr 2004
Posts: 919
Location: PCA Milwaukee Region
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| Posted: Fri Jun 15, 2007 2:41 pm Post subject: Re: Fuel Pump Choice |
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| isuras2 wrote: | | I called SAP to get info on fuel pumps for my '80 924 NA. The internal is $75 and new OEM. The external is $190 and bolts right in. There is also the Piersburg #98154 which is $150. The guy said that one has different fittings that would need some work to make it fit. Anyone gotten the Piersburg and successfully gotten it connected? I was also looking for fuel pumps for a 1978 928. The fuel pumps for that are the same as those for my car. |
I went with the Pierburg pump. Sounded like a better design. The Bosch is a centrifugal pump whereas the Pierburg is piston. I've been told the Bosch uses metal parts for the pump mechanism and the Pierburg uses a type of plastic and as such is more quite, but have never verified. When the Bosch wears out, you get metal shavings in the fuel system.  The Pierburg just sounds better.
The "difference in fittings" is due to the fact the Pierburg comes with an adapter that is easily mistaken for the required check valve. Really there is no difference in dimensions or thread size, just that you should substitute preferably a new check valve for the adapter if you want to do it right. I think the check valve is like $20.
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1981 931 (Concours)
1982 931 (Daily Driver)
"Think outside the box" |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Fri Jun 15, 2007 4:38 pm Post subject: |
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I'm running the P'berg, nice and quiet, no problems.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Sun Jun 17, 2007 6:43 pm Post subject: Re: Fuel Pump Choice |
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| Tigger937 wrote: | | The Bosch is a centrifugal pump whereas the Pierburg is piston. |
Sorry, Tigger, the Bosch pump is positive displacement, 'roller cell' type (sprung ball bearings - see Haynes manual 80), a centrifugal pump could never provide the pressure.
Apart from that, +1.
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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Tigger937
Joined: 11 Apr 2004
Posts: 919
Location: PCA Milwaukee Region
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| Posted: Sun Jun 17, 2007 7:55 pm Post subject: Re: Fuel Pump Choice |
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| Mike924 wrote: | | Tigger937 wrote: | | The Bosch is a centrifugal pump whereas the Pierburg is piston. |
Sorry, Tigger, the Bosch pump is positive displacement, 'roller cell' type (sprung ball bearings - see Haynes manual 80), a centrifugal pump could never provide the pressure.
Apart from that, +1. |
In the classical sense of the word, you are correct. The 'roller cell' is in what I would consider the same family as the classical centrifugal pump, more so than the piston family.
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1981 931 (Concours)
1982 931 (Daily Driver)
"Think outside the box" |
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924RACR
Joined: 29 Jul 2001
Posts: 9066
Location: Royal Oak, MI, USA
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| Posted: Sun Jun 17, 2007 10:00 pm Post subject: |
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The Pierburg is also a roller style - but its roller elements are made of plastic as mentioned, so they're more tolerant of dirt in the fuel - stupid Bosch design will just lock up with such tight tolerances. That also makes the Pierburg pump quieter, not to mention the better sound insulation.
I'm happily running the Pierburg pump on both my racecar and the DD 931.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Tigger937
Joined: 11 Apr 2004
Posts: 919
Location: PCA Milwaukee Region
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| Posted: Tue Jun 19, 2007 8:15 am Post subject: |
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| 924RACR wrote: | | The Pierburg is also a roller style |
Really??? SAP told me otherwise when I purchased mine a few years ago. I'll have to try and do a better job of confirming my sources. I apologize for that. Hope it didn't affect anyone.
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1981 931 (Concours)
1982 931 (Daily Driver)
"Think outside the box" |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Tue Jun 19, 2007 11:50 am Post subject: |
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| Tigger937 wrote: | | Hope it didn't affect anyone. |
Meh, nothing a week or two of counseling won't put behind me.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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