Holley 4160 question
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Holley 4160 question

  1. #1
    Senior Member jet460's Avatar
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    Default Holley 4160 question

    My boat has dual 4160's (450cfm)
    The other day at the lake, the rear carb flooded out so I came home.
    Fuel was pouring out of the front bowl vent tube as soon as the pump was on.
    I have an electric pump from summit.
    7psi/90gph.

    The front carb has no problem at all.

    Changed the needle/seat today.
    Float was fine. Not sunk or anything like that.
    Set it the same as the other carb.

    With the new needle/seat, it does the same thing.
    Just pours all over the place like there is no needle/seat at all.

    Not sure how this can happen...

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  3. #2
    Got Circus Midgets??? BIGAMIST's Avatar
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    Had the same thing happen to my 450s....on the 3rd new needle & seat the problem was solved.



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    When I die I want to go nice and peaceful in my sleep like Grandpa did, not screaming like the other passengers in His car.

  4. #3
    Senior Member jet460's Avatar
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    I rebuilt both about a month ago, so this is the second new needle/seat.
    I'll try swapping with the other carb and see what happens.

    These things are pretty old, so I almost have a good enough excuse to go buy new 650's..

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  6. #4
    Senior Member sandeggo's Avatar
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    Quote Originally Posted by jet460 View Post
    I rebuilt both about a month ago, so this is the second new needle/seat.
    I'll try swapping with the other carb and see what happens.

    These things are pretty old, so I almost have a good enough excuse to go buy new 650's..
    I am by no means a carb guy but have you checked to make sure the float isn't filling with gas?
    Nevermind I just reread your post.
    Last edited by sandeggo; 06-01-2010 at 04:06 PM. Reason: Cuz I am a retard

  7. #5
    Senior Member jet460's Avatar
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    I just swapped the needles front to back. Same exact problem.

    Fuel pressure is actually 12psi, which probably answers my own question.

    I guess I have been lucky this did not happen earlier?

  8. #6
    Senior Member jet460's Avatar
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    Thanks to a piece of good advise from Bell&Gaines, I took out the check ball/spring from my Summit fuel pump, cleaned it off, put it back in...now I have 5-7psi instead of 12.

    Problem solved.

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