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Fuel Petcock

Discussion in 'XJ DIY How-To Instructions' started by Rick Barney, Nov 21, 2017.

  1. Rick Barney

    Rick Barney New Member

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    Just rebuilt my 85 Maxim X fuel petcock. Now fuel runs freely from all 3 settings. When I put the tank on the bike and hook up the vacuum hose, no gas goes through the plastic fuel filter. Did I install the seals and diaphram incorrectly, or could the vacuum hose have a leak or blockage. Can I just disconnect the vacuum hose and run on prime all the time. Any suggestions? Thanks in advance for any advice.

    Rick
     
    Rick Barney, Nov 21, 2017
    #1
  2. wgul

    wgul Active Member

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    When set on "on" the fuel won't flow until the engine is running. The vacuum line must be attached to the petcock. When the engine is running, it creates a vacuum that opens the diaphragm in the petcock letting the fuel flow. When the engine is off, it should only be running freely on the prime and (I believe reserve ) positions. You could disconnect the vacuum line, plug it, and run it as a manual on and off valve but is that what you really want?
     
    wgul, Nov 22, 2017
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  3. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Only in the PRime position..................reserve also requires vacuum.
     
    chacal, Nov 22, 2017
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    wgul and hogfiddles like this.

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