Carb help
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Carb help

  1. #1
    Senior Member
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    Default Carb help

    I picked up this boat recently and I'm finally getting around to tinkering. It has 2 Holley vacuum secondary carb. I have never had vacuum secondaries and noticed the vacuum canisters are just connected to each other and that's it. Doesn't seem right to me maybe someone here can chime in on this and explain the thought process. Thanks. I tried uploading a pic but wont work from my phone.

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  3. #2
    CAPTAIN KRYLON
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    The diaphram gets it's vacuum / lack of vacuum signal from the body of the carb.
    There should be a rod through the bottom half of the housing that connects the diaphram to the secondaries.
    On multible carb applications some link the two together to insure an equal signal.

  4. #3
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    Thanks for the reply. I guess I just don't know where the vacuum comes from if the canisters are just connected together with no other vacuum lines, anywhere .

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  6. #4
    CAPTAIN KRYLON
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    There is a port on the carb body that meets a port on the inside of the vac canister with a small roung cork gasket. By having the canister on the carb body the connection is made.

  7. #5
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by cubegenie View Post
    Thanks for the reply. I guess I just don't know where the vacuum comes from if the canisters are just connected together with no other vacuum lines, anywhere .
    vacume source is thru a small passage in the side of the carb body sealed between the servo and the carb with a small oring (cork/paper) The tube is an attemp to "equalize" the servos to get them to open simutaneously Tom

  8. #6
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    Makes sense now. Thanks for the help.

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