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6.9 IDI thread seal for top of injector?

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Tony Stottler, Jan 26, 2021.

  1. Tony Stottler

    Tony Stottler Registered User

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    Im taking a moment thank everybody who has replied to my questions. Every response is appreciated.
    Existing fuel supply line to new injector leaks at compression fitting. Concerned about stripping threads so tight, still leaking. Advice?
     
    Last edited: Jan 27, 2021
  2. miles1400

    miles1400 Full Access Member

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    are you sure it is a supply line leaking and not a return line cap?
     
  3. Tony Stottler

    Tony Stottler Registered User

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    Yes. I can see fuel bubbles along with seepage if fuel coming out from under the nut on supply line
     
  4. Tony Stottler

    Tony Stottler Registered User

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    Yes I can see bubbles along with fuel seepage coming out from under the nut of the compression fitting at the top of the injector
     
  5. nelstomlinson

    nelstomlinson Full Access Member

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    Tony, the bottom of that nut is the top of your return cap. I wonder if the upper oring in that cap is damaged and letting it leak out the top of the return cap?
     
  6. FrozenMerc

    FrozenMerc Registered User

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    I agree, that is is most likely a return line issue. However, take a close look at the sealing surface (flare) of the injection line. It is possible that the flare is damaged, misshaped or cracked. Do NOT use thread sealant, as the threads aren't meant to seal anything.

    [​IMG]
     

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