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Does it matter which vacuum port u hook

Discussion in 'XJ Technical Chat' started by volsrock1963, Jun 15, 2025.

  1. volsrock1963

    volsrock1963 Member

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    Does it matter which vacuum port u hook the petcock vacuum hose to? And does it matter how long it is?

    I have a slight fuel leak above the carbs so I am going to replace the hose and clamps on the petcock

    82 Seca 750
     
    Last edited: Jun 15, 2025
    volsrock1963, Jun 15, 2025
    #1
  2. Huntchuks

    Huntchuks Well-Known Member

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    It doesn't matter at all.
     
    Huntchuks, Jun 16, 2025
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  3. volsrock1963

    volsrock1963 Member

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    Can I loop the hose from petcock to carbs if I have to?
     
    volsrock1963, Jun 16, 2025
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  4. Huntchuks

    Huntchuks Well-Known Member

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    Not sure what you mean by "loop" to carbs. You cannot connect to carbs. Just make sure it is not kinked or you might not get enough vacuum to operate the diaphragm in the petcock.
     
    Huntchuks, Jun 16, 2025
    #4
  5. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Correct.
     
    hogfiddles, Jun 18, 2025
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  6. Dave in Ireland

    Dave in Ireland Well-Known Member

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    There was a notion going around if you interconnect the vacuum ports you could do some kind of YICS system, but it's a load of bollocks.
     
    Dave in Ireland, Jun 19, 2025
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    Franz and Brhatweed like this.
  7. Brhatweed

    Brhatweed Well-Known Member

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    YICS is a carefully placed port that imparts a swirl on the incoming air/fuel charge behind the intake valve, interconnecting the vacuum ports on the intake boots will do nothing but close up the holes. As Dave in Ireland pointed out it's a load of bollocks.
     
    Brhatweed, Jun 19, 2025
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    hogfiddles likes this.
  8. Dan Gardner

    Dan Gardner Well-Known Member Premium Member

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    Nevermind the bollocks…
     
    Dan Gardner, Jun 19, 2025
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  9. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    You are also correct.
     
    hogfiddles, Jun 19, 2025
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