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Registered User
Join Date: Sep 2017
Posts: 7
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Leaking Fuel Pump 74 911 CSI
74 911 Carrera 2.7 US CSI fuel injection with bosh fuel pump.
Hello all, My fuel pump appears to be leaking at the armature housing / pump o ring seal. Does anyone know if this o ring is serviceable? I've located a new O.E. M. pump. However @ $600.00+, I'm looking for an alternative solution . Does anyone have experience with the PIERBURG universal replacement pump for this application. Its sits tight under on the car. The Pierburg literature sat "mirror modifications needed " Appreciate your feedback Mike |
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09-03-2017, 10:54 AM
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Administrator
Join Date: Aug 2016
Location: Los Angeles, CA
Posts: 6,087
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Hello and welcome to the forum Mike - I'm attaching a link to our site's DIY tech article on the fuel pump replacement procedure; I hope you find it helpful. Please let us know if you have any questions!
Porsche 911 Fuel Pump Replacement | 911 (1965-89) - 930 Turbo (1975-89) | Pelican Parts DIY Maintenance Article |
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09-05-2017, 09:41 AM
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77 911s 16 981gts |
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09-05-2017, 12:29 PM
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Registered Minimalist
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I did the pierburg replacement. So far, so good. The minor mods needed are probably in reference to adapting it for a check valve. I comes with everything you need except for one part, the cap. The cap is a metal fuel cap that goes on the end of the check valve that is included and after the banjo fitting. Assuming you use the banjo fitting that is stock on your fuel line. Some say the check is inline in the banjo, but I had hot start issues after installing the new pierburg, so I installed an aftermarket check valve and the hot start issue is gone.
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Duane / IG: @duanewik / Youtube Channel: Wik's Garage Check out my 75 and 77 911S build threads |
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09-05-2017, 12:44 PM
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Join Date: Sep 2017
Posts: 7
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Duane ..thanks for the feedback ...the Pierburg replacement pump shows the check value and adaptors in the illustrations... im assuming they come with the new pump kit I'll confirm. ...I was panning on using my existing stock banjo fitting. Question? the fuel lines on the OEM pump attach to the side rear of the pump... the replacement are at the end of the pump. Once the fuel lines are secure...does the replacement pump fit on the OEM bracket and still bolt to the pump carriage under the car?
Mike |
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09-05-2017, 02:47 PM
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I've got a 74 and did the Pierburg swap. It does sit the other way around so some modifications to the hoses and wiring has to be done. I did a forum post on the change. I'll see if I can find a link to it.
Sent from my iPhone using Tapatalk
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Bone stock 1974 911S Targa. 1972 914/4 Race Car |
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09-05-2017, 04:17 PM
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Here's the thread:
Pierberg Pump Install I didn't go into much detail, but long story short you'll have to cut some tubing and wires and re-plumb - wire. Other than that it physically fits and does provide the proper pressures, etc. -C
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Bone stock 1974 911S Targa. 1972 914/4 Race Car |
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09-05-2017, 06:35 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,421
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Pull it apart and replace the oring between the electric section and pump section. See here: MFI Open Heart Surgery II - The Fuel Pump
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 Last edited by john walker's workshop; 09-06-2017 at 05:26 AM.. |
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09-05-2017, 07:54 PM
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Registered User
Join Date: Sep 2017
Posts: 7
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Duane .. you mention a metal cap the goes at the end of the check valve on the new pump need to secure the banjo ... see lick below .. is this the correct one ?
Mike Cap Nut 90007001002 - Genuine Porsche - 900-070-010-02 | Pelican Parts |
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09-11-2017, 07:11 PM
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Registered Minimalist
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That looks like the correct one. I sourced mine from a forum member (Len aka boxtergt) that makes replacement fuel lines so I never had to check part numbers etc. easy enough to check though just grab an m10 x 1.25 nut and see if it threads on. Don't forget to use the enclosed crush washers to seal.
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Duane / IG: @duanewik / Youtube Channel: Wik's Garage Check out my 75 and 77 911S build threads |
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09-11-2017, 08:54 PM
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Registered User
Join Date: Sep 2017
Posts: 7
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thanks for the info ..I'll keep u updated
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09-12-2017, 05:25 PM
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Registered
Join Date: May 2004
Location: New Hampshire
Posts: 6,133
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 In case anyone needs them, I keep the M12x1.5 Cap Nut and Copper Crush Rings for the Banjo in stock. Please email me for details. Len at Autosportengineering dot com
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09-13-2017, 05:41 AM
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Registered User
Join Date: Sep 2017
Posts: 7
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Hello All... Feedback .. After further reach ... I found a Fuel Injection rebuilder that specializes in rebuilding vintage Bosch FI parts / etc .. For about the same cost as the retrofit replacement ... I had my OEM rebuilt without any of the modification headaches. The turnaround was less then a week...Pump installed working fine ....
Fuel Injection Corporation ...Tracy CA....Ask for Kathy ...tell her Mike from Boston refereed ... |
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10-09-2017, 07:09 AM
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Registered User
Join Date: Sep 2017
Posts: 7
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Hello All... Feedback .. After further reach ... I found a Fuel Injection rebuilder that specializes in rebuilding vintage Bosch FI parts / etc .. For about the same cost as the retrofit replacement ... I had my OEM rebuilt without any of the modification headaches. The turnaround was less then a week...Pump installed working fine ....
Fuel Injection Corporation ...Tracy CA....Ask for Kathy ...tell her Mike from Boston refereed ... |
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10-09-2017, 07:10 AM
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1977 S
981gts
1975 Porsche 911s
1974 Porsche 911S Targa
