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Thread: Sourcing a Vacuum Line? Do i need an inlet?

  1. #1
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    Sourcing a Vacuum Line? Do i need an inlet?

    Hi All,

    I want to install power brake booster to my mustang but i have been told i need a vacuum line.
    Can someone help me source one!

    I have 1992 FORD high performance GT engine
    Below is the pic of the carburetor front view.

    http://imageshack.us/f/684/imag0649edit.jpg/

    The left and middle red arrows are connected and I'am guessing these are the vacuum lines.
    The pinkish arrow on the far right has a small plug on it but this seems really small.
    The top blue arrows have screws on it which when unscrewed has an empty hole.

    Can i put a barb or an inlet that can screw into here? Where would i source one? How big would it be?

    This being said all of the vacuum lines for power brake boosters connect to the back of the carburetor.

    Below is a picture of the back the carburetor.
    http://imageshack.us/f/220/imag0651c.jpg/

    There are various hex screws. Can i stick a barb or an inlet here? Any help would be appreciated.

  2. #2
    Registered User 2V8s's Avatar
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    you might find a port, or place for a screw in take-off on the inlet manifold also.

    Im not familiar with the fox cars but hopefuly someone has a car with booster who can tell you where they usually connect. Most cars I have seen come from the manifold.

    You need a fair sized port, plus if from the carb it needs to be below the throttle valve so its not "ported" or controlled otherwise you will have no boos when engine is idling or on deceleration. So basically as low on the carb as poss.

    For a vac line, once you know the size (take a guide from the booster its self?) then probably a piece of rubber vac pipe or even fuel pipe from halfords of roughly the right diameter would do the job, cut to size.
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  3. #3
    Registered User blacktop's Avatar
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    Vacuum supply for the booster needs to come from the inlet manifold as 2V8s has stated.
    Here's my set up. You can follow the hose from the manifold to the brake booster:


    Alan

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    Alan,

    What a ledge!

    Thats exactly the same setup i have but in yellow lol!



    Where it is going in your picture mine is filled with a hex screw! i will have to unscrew that and put in a barb or an inlet!

    Any idea what size the screw for the port is??

    I have seen this website where they have fittings for water pumps. I suppose it will do the same job as they also have to be air and water tight.

    http://www.watercoolinguk.co.uk/cat/...tings_137.html
    http://www.watercoolinguk.co.uk/cat/...Barbs_136.html

  5. #5
    Registered User blacktop's Avatar
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    Yeah, that hex is just a plug. Thread size is G3/8 if I remember right.
    Just replace plug with a hose fitting and you're good to go.
    Alan.

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    Alan, what a life saver!

    Thanks so much, will keep you updated once i source and fit the part.

  7. #7
    Registered User blacktop's Avatar
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    Glad to help mate, that's what this forum is all about.

  8. #8
    Registered User WBR's Avatar
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    Blacktop is correct on a major intake manifold vacuum source.
    Either of the plugs or the large port on the bottom of the carb.

    Another very important piece is the check valve that goes into the front of the vacuum brake booster. Make sure your booster comes with this piece (most do)
    It is a one way check valve that holds vacuum in the booster even when the engine is off. That way you still have brakes for 1 to 5 pushes of the brake pedal.
    Scott

    WBR Import Export
    Sugar Land, Texas
    832-886-1677
    scott@wbrexports.com
    http://www.scottmarlow.net

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