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fuel petcock question

Discussion in 'XJ Technical Chat' started by yamahaha, May 6, 2016.

  1. yamahaha

    yamahaha Member

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    Gday fellow xjers, just wanted to know which position is which on my xj. I have pri at 3pm, res at 9am and on at 12pm. Any help greatly appreciated
     
    yamahaha, May 6, 2016
    #1
  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    That is correct. Prime is for filling dry float bowls after sitting. On is where the petcock should normally be kept. Reserve is...well it's reserve. The petcock is vacuum operated.
     
    k-moe, May 6, 2016
    #2
  3. yamahaha

    yamahaha Member

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    Yeah righto, so there is no off position?
     
    yamahaha, May 6, 2016
    #3
  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Correct. When engine vacuum is lost (upon shutdown) the vacuum valve on the petcock closes and shuts off fuel flow.
    Rebuild thread here: http://www.xjbikes.com/forums/posts/213052/
     
    k-moe, May 6, 2016
    #4
    Lightcs1776 likes this.
  5. yamahaha

    yamahaha Member

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    Thanks my man, you're a wealth of knowledge
     
    yamahaha, May 6, 2016
    #5
  6. rocs82650

    rocs82650 Well-Known Member

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    On is at 6 o'clock on my bike.
     

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    rocs82650, May 8, 2016
    #6
  7. FetusChrist

    FetusChrist New Member

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    Random question. Instead of rebuilding or finding a new vacuum petcock I just got a gravity fed off ebay for 5 bucks and plugged up the vacuum line that led to the old. Is there any issue with doing this to these bikes?
     
    FetusChrist, May 8, 2016
    #7
  8. rocs82650

    rocs82650 Well-Known Member

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    No but add a in line filter if there isn't one.

    Gary H.
     
    rocs82650, May 8, 2016
    #8
  9. FetusChrist

    FetusChrist New Member

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    Added one with the new fuel line.
     
    FetusChrist, May 8, 2016
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  10. JB24

    JB24 New Member

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    I went the rebuild route. Easy job-did it sitting at the workbench one Friday night after Chacal set me up with the rebuild kit.

    JB
     
    JB24, May 8, 2016
    #10
  11. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The only issue with fitting a non-vacuum petcock is remembering to turn it on.
     
    k-moe, May 8, 2016
    #11
  12. XJ550H

    XJ550H Well-Known Member Premium Member

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    and remembering to turn it off....
     
    XJ550H, May 8, 2016
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