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Thread: 1994 GM P-30 TBI ?s

  1. #16
    Fuel Injected!
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    So your saying the large steel fitting that threads into TBI leaked? or just the plug / gage ports?

  2. #17
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    ya there is 3 possible places it could leak from, where it goes into the fuel pod, where the hardline threads into or one of the ports to hook a fuel gauge up to. i have not used this fitting but they have been around for 15+ years, it is very possible you got a bad one.

    it sounds like it's leaking from the npt ports, sounds like you used the wrong dope or didn't tighten them enough. my solution for a leaking npt fitting has always been just tighten it down more until it stops.
    Last edited by tayto; 05-05-2023 at 08:38 PM.

  3. #18
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    Quote Originally Posted by Sledhead2 View Post
    So your saying the large steel fitting that threads into TBI leaked? or just the plug / gage ports?

    The gauge ports. Permatex 2 used.
    Last edited by udidwht; 05-05-2023 at 10:39 PM.
    1994 GM P-30 Southwind Storm 28ft
    454 TBI w/4L80E trans
    VIN #1GBJP37N4R3314754

  4. #19
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    Ok, Seeing it is the NPT gag ports get something like this shown below. My thinking is the gage ports were tapped a little to deep and that when you put plugs or gage in you are not getting the proper interference fit with the treads.

    Permatex 2 is not gasoline résistance.

    They do sell very small tubes of this stuff at home depot and other places

    https://www.zoro.com/loctite-pipe-se...specifications

  5. #20
    Fuel Injected! PlayingWithTBI's Avatar
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    Meh, I just used Teflon tape, had it on for ~4 years now with no runs, drips, or errors
    IMG_0833.jpg

  6. #21
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    ya i use the yellow "gas" teflon tape or actual thread sealant. I used that aviation form a gasket stuff in my younger days, but it doesnt seem to hold up well to oil.

  7. #22
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    Quote Originally Posted by Sledhead2 View Post
    Ok, Seeing it is the NPT gag ports get something like this shown below. My thinking is the gage ports were tapped a little to deep and that when you put plugs or gage in you are not getting the proper interference fit with the treads.

    Permatex 2 is not gasoline résistance.

    They do sell very small tubes of this stuff at home depot and other places

    https://www.zoro.com/loctite-pipe-se...specifications
    Permatex 2 is indeed gasoline resistant.


    https://www.permatex.com/products/ga...sealant-11-oz/
    1994 GM P-30 Southwind Storm 28ft
    454 TBI w/4L80E trans
    VIN #1GBJP37N4R3314754

  8. #23
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    Permatex 2 is resistant, not gas proof. Get some Teflon tape or pipe sealant and you should be good to go.

  9. #24
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    https://www.permatex.com/products/th...sealant-50-ml/

    this a real thread sealant. i use it on everything automotive from head bolts that go into coolant, intake bolts into oil, carb fittings etc

  10. #25
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    Quote Originally Posted by tayto View Post
    https://www.permatex.com/products/th...sealant-50-ml/

    this a real thread sealant. i use it on everything automotive from head bolts that go into coolant, intake bolts into oil, carb fittings etc
    Have a tube of that and ordered some Gasoila.
    1994 GM P-30 Southwind Storm 28ft
    454 TBI w/4L80E trans
    VIN #1GBJP37N4R3314754

  11. #26
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    Update:

    I used Permatex High performance thread sealant on the plug and Gasoila E-Seal on the adapter fitting. No leaks. We can right this one off in the history book.
    Last edited by udidwht; 05-26-2023 at 03:49 AM.
    1994 GM P-30 Southwind Storm 28ft
    454 TBI w/4L80E trans
    VIN #1GBJP37N4R3314754

  12. #27
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    good stuff

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