fuel shooting from the studs
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fuel shooting from the studs

  1. #1
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    Default fuel shooting from the studs

    ok, lets count the mistakes I am making here and see if we can figure out why fuel is shooting from the studs.

    I just had the intercooler flange changed from a 4150 to a dominator patter.

    Got a spacer, slotted it, welded it...viola.

    Bolted it on, went for a run and as soon as I hit boost I started shooting fuel every where. Leaked out of the gasket, and the studs. I thought maybe the ruberized gasket was a bad idea and opted to try double gasketing it with paper gaskets.

    pulled it off.

    put down a light layer of black silicone on the manifold, and a light layer on the intercooler. Put the studs in and then backed them off a little so I would have more to thread the nut on to (this is where my brother thinks I went wrong). Put a little black silicone around the studs. Put the gaskets on, put the intercooler on, and then put a lockwasher on each stud...tightened it some. The next day I tightened it all down tight.

    Brought it out on the lake a day later and gas was shooting from the studs as soon as I hit boost. So I made SOME progress in that I localized the fuel leak...but umm...ya.

    So how many mistakes am I making here?





    This was the original gasket I had on there:


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  3. #2
    Senior Member Hass828's Avatar
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    Default Dayum!

    LOL, I have had mine off more times than I care to remember and I dont believe I have ever changed the gaskets, And I had a NOS plate under there too. Never had a problem. Something isnt flat . check with a good straight edge and you'll more than likely find the problem.
    Last edited by Hass828; 07-21-2010 at 05:24 AM.
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  4. #3
    No Sandbar To Far sanger rat's Avatar
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    Default

    And ditch the silicone.

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  6. #4
    Wet
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    Some info is missing...

    How much boost?

    Between a blower and intake is merely a thin paper gasket, no goop.

    Are the two surfaces flat?
    Put a small flashlight in the intake, mate the intercooler without gaskets, do you see a lot of light? Is the gap greater than what a gasket can handle?

    Are the holes thru driller for the studs?

    Are the studs 5/16", but the mounting holes are 7/16" or greater?

  7. #5
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    Quote Originally Posted by Wet View Post
    Some info is missing...

    How much boost?

    Between a blower and intake is merely a thin paper gasket, no goop.

    Are the two surfaces flat?
    Put a small flashlight in the intake, mate the intercooler without gaskets, do you see a lot of light? Is the gap greater than what a gasket can handle?

    Are the holes thru driller for the studs?

    Are the studs 5/16", but the mounting holes are 7/16" or greater?
    it would shoot in as little as 1.2lbs of boost

    I will check the gap

    not sure what you mean about thru drilled.

    good question on the studs. It started off life as a spacer like this (except 2 inch)



    I originally used the studs that came with it.

  8. #6
    i'm back!! 1QuickCP's Avatar
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    clean everything, set inercooler on with NO gasket and check for flat, better not wiggle as all. You should see no gaps anywhere at all unless its a warped mess from welding. I always fly cut the carb surface after welding.

    Oh and id make longer studs and locktite them in tight btw
    Last edited by 1QuickCP; 07-21-2010 at 07:12 AM.

  9. #7
    Wet
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    If you remove the studs, do the threaded holes go all the way thru, or do they bottom out?

  10. #8
    TJS
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    After reading your email to me I thought you had leaks from where the heat exchanger caps are that bolt into the upper plenum. Does your “lower” intake manifold have blind holes where the studs go. Did you have someone watch from the back seat while you drive to see exactly where the “fuel spray” is coming from.

    By the way. I welded it and it is flat within a few thou. Nothing a gasket cannot take up. At least is was when it left me.
    T.J.

  11. #9
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    Quote Originally Posted by TJS View Post
    After reading your email to me I thought you had leaks from where the heat exchanger caps are that bolt into the upper plenum. Does your “lower” intake manifold have blind holes where the studs go. Did you have someone watch from the back seat while you drive to see exactly where the “fuel spray” is coming from.

    By the way. I welded it and it is flat within a few thou. Nothing a gasket cannot take up. At least is was when it left me.
    T.J.
    I had my brother and wife both watching a sides They just said it was coming out from the studs (I am not sure if it was below of above the nuts...I will ask them.

    I know you had checked it for flat so its not anything I have even looked at. I know how meticulous you are.

    What do you mean by blind holes?

  12. #10
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    Quote Originally Posted by Wet View Post
    If you remove the studs, do the threaded holes go all the way thru, or do they bottom out?
    I believe they bottom out...but I will double check to be sure.

  13. #11
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    as TJ said...its pretty flat...it passed the flashlight test.

  14. #12
    Senior Member lbhsbz's Avatar
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    fuel dissolves silicone. If you're gonna use anything, use hylomar.

    If surfaces are flat and you didn't drop a washer over one of the studs before you slid the gasket on, you shouldn't need any goop.

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