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Thread: Rebuilding MFI fuel pump (The one that pumps fuel from the gas tank)

  1. #1

    Rebuilding MFI fuel pump (The one that pumps fuel from the gas tank)

    So I have an extra fuel pump on the shelf from a 73 E MFI parted out long ago. Can this pump be saved and made trust worthy? If so, how?

    1. After removing the 4 slot screws, I removed the cap from the end that has the inlet/outlet holes for the fuel lines and noticed two O rings. Is there a replacement source for these two O rings?

    2. If not, can I soak the O rings in gasoline to get them to swell up, coat them with bearing grease for protection, reassemble and expect the fuel pump to function normally?

    3. Or do I need to proceed further to resuscitate this pump? Do I need to circulate some kerosene through pump for storage protection?

    My local Porsche dealer is quoting a price approaching 4 digits for a new one, so I would like to save this one as a traveling spare if possible.


    69 912
    73 Sporto S
    17 991.2

  2. #2
    A fuel pump is a critical item, I myself would not attempt to overhaul one. I have several that I sent out for rebuild sitting on the shelf. I have run these for years with no problem.

  3. #3
    Thanks for the reply Rick. So who did you send the fuel pump out to for rebuild?



  4. #4
    member #1515
    Join Date
    Mar 2009
    San Antonio, Texas

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs

  5. #5
    Senior Member
    Join Date
    Sep 2009
    Is the fuel delivery rate from these fuel pumps critical to active the MFI injection pump. ?
    beltwerks will attend the LA lit meet.
    S Registry # 1660
    Le Belgique ST build.

  6. #6
    John, I sent it to Fuel Injection Corp. in California. Pump comes back looking like new.

  7. #7
    Quote Originally Posted by stretch View Post
    Is the fuel delivery rate from these fuel pumps critical to active the MFI injection pump. ?
    One is for carbs,009 I think, and one is for MFI, 001 I think. Carbs puts out about 6 psi,,, and mfi about 35 psi.
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

  8. #8
    So you need a MFI fuel pump for a MFI car and I second Fuel Injection Corp. in California and the pump comes back looking new(what Rick said).

  9. #9

    Thanks to all for the great help and advice. Email sent to Fuel Injection Corp for rebuild info.


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