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Thread: MFI oil leak

  1. 06-15-2015, 04:57 AM #1
    Orange71S
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    MFI oil leak

    Gang,
    Last night, while assembling/preparing my 71 S for the Parade next week, I noticed a large pool of oil under the engine. The oil is coming from the high-pressure oil line to the MFI. I removed the line and fittings, cleaned everything and put it back together with teflon tape on the threads. The leak is better, but still very leaky. I assume that the threads are bad on the MFI unit.
    I know this is pretty bad, but does anyone have an idea for a quick fix so I can drive to the Parade next week?
    Thanks Much!
    Jay Yost
    1946 Willys Army Jeep
    1956 356A Cab
    1957 356A Speedster
    1959 Austin-Healey Sprite
    1962 356B Notchback
    1969 911T 'Speedster'
    1971 911S
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  2. 06-15-2015, 06:26 AM #2
    xpensivewino
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    If the threads are stripped, then that fitting is removable from the pump body and can be replaced. If you can find someone locally with a core pump you could steal the fitting, or a hydraulic supply place may be able to match the fitting. Seems odd that it would all of a sudden leak from a stripped thread? Are you sure the hose isn't ruptured. I've seen these blow out before on other cars, and it can make a mess!
    1969 911 E #824
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  3. 06-15-2015, 06:44 AM #3
    Orange71S
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    Wino,
    It's not leaking from the fitting (of which I have a spare), oil is coming from the pump body and the pump body threads are what is questionable. It does seem odd that it would spring a leak like that, but.......
    No, the hose is not ruptured. Initially, I hoped that was the case, but I have seen oil running down the vertical wall of the pump body.
    Thanks!
    Jay Yost
    1946 Willys Army Jeep
    1956 356A Cab
    1957 356A Speedster
    1959 Austin-Healey Sprite
    1962 356B Notchback
    1969 911T 'Speedster'
    1971 911S
    1974 Ford Ranchero
    1986 911 Carrera Cab
    1993 Audi V8Q
    2001 Mazda Miata 'Daughters Car'
    2008 Audi S6
    2018 Panamera 4S 'Wife's Car'
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  4. 06-15-2015, 08:24 AM #4
    csbush
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    If it were me, I would call Gus Pfister at Pacific Fuel Injection. (502-283-5615) Explain your problem, and he can probably help. I have had him ship out plate seals and such parts.
    Chuck

    Early 911S registry #380
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  5. 06-15-2015, 09:49 AM #5
    Orange71S
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    Thats a good idea. Gus rebuilt the pump a couple of years ago, anyway.
    Thanks Much!
    Jay Yost
    1946 Willys Army Jeep
    1956 356A Cab
    1957 356A Speedster
    1959 Austin-Healey Sprite
    1962 356B Notchback
    1969 911T 'Speedster'
    1971 911S
    1974 Ford Ranchero
    1986 911 Carrera Cab
    1993 Audi V8Q
    2001 Mazda Miata 'Daughters Car'
    2008 Audi S6
    2018 Panamera 4S 'Wife's Car'
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  6. 06-15-2015, 11:20 AM #6
    Orange71S
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    I just spoke to Gus at Pacific Fuel Injection and he told me that I could fill the MFI pump with oil and put bolts in the oil lines. He said as long as it was full of oil, there should be no problem.
    This seems really risky to me.....has anyone had any experience with this? Does anyone recommend it?
    I appreciate it!
    Jay
    1946 Willys Army Jeep
    1956 356A Cab
    1957 356A Speedster
    1959 Austin-Healey Sprite
    1962 356B Notchback
    1969 911T 'Speedster'
    1971 911S
    1974 Ford Ranchero
    1986 911 Carrera Cab
    1993 Audi V8Q
    2001 Mazda Miata 'Daughters Car'
    2008 Audi S6
    2018 Panamera 4S 'Wife's Car'
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  7. 06-15-2015, 11:24 AM #7
    RSTarga
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    Thats what Mercedes did on their pumps. They had a little oil level plug to check the level.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs
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  8. 06-15-2015, 11:39 AM #8
    xpensivewino
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    If Gus is ok with it, I'd feel pretty comfortable. I don't think that is his suggestion for a permanent fix, but rather to get you through your show. Then you can have a permanent fix done properly.
    1969 911 E #824
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  9. 06-15-2015, 11:51 AM #9
    sithot
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    As seen on this 3.2SS. Works fine. This one has mechanical enrichment too.
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  10. 06-16-2015, 04:11 AM #10
    Rusty
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    Most pumps used in racing were this way. Not contaminated with engine oil.
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