Spare Fueltank - Leaking Caps





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  1. #1
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    Default Spare Fueltank - Leaking Caps

    Best Wishes for 2017 Everyone - May it be a year filled with lots of incredible adventures and special memories!

    Need some advice regarding diesel seeping through between the filler cap and aux tank, please.
    It comes through the "washers" at the bottom - any advice to rectify this or to change it?
    (Tanks were entirely DIY) - please see attachment for image.

    Look forward to any advice please.
    Attached Images Attached Images  
    Heinrich
    @rontgen_za
    Isuzu KB300 Dteq 2010


  2. #2
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    Default Re: Spare Fueltank - Leaking Caps

    Hi,

    That looks like a cap from a hydraulic oil tank and has a built in breather. It is not suitable for fuel.

  3. #3
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    Default Re: Spare Fueltank - Leaking Caps

    Quote Originally Posted by John Allan View Post
    Hi,

    That looks like a cap from a hydraulic oil tank and has a built in breather. It is not suitable for fuel.
    Thank you John, will look into it - appreciate the feedback.
    Heinrich
    @rontgen_za
    Isuzu KB300 Dteq 2010


  4. #4
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    Default Re: Spare Fueltank - Leaking Caps

    I'd say replace the cork washers with something actually sealable. Like silicon.
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  5. #5
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    Default Re: Spare Fueltank - Leaking Caps

    Quote Originally Posted by jelo View Post
    I'd say replace the cork washers with something actually sealable. Like silicon.
    Silicon not fuel resistant it will perish. Rubber seals.

  6. #6
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    Default Re: Spare Fueltank - Leaking Caps

    Quote Originally Posted by Jack Russell View Post
    Silicon not fuel resistant it will perish. Rubber seals.
    That is true. Sorry.

    This will work:

    https://www.permatex.com/products/ga...lange-sealant/
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  7. #7
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    Default Re: Spare Fueltank - Leaking Caps

    Quote Originally Posted by Jack Russell View Post
    Silicon not fuel resistant it will perish. Rubber seals.
    Quote Originally Posted by jelo View Post
    That is true. Sorry.

    This will work:

    https://www.permatex.com/products/ga...lange-sealant/
    Thank you very much, Jack Russell & Jelo - appreciate the assistance - will give it a try and let you know how it works.
    Heinrich
    @rontgen_za
    Isuzu KB300 Dteq 2010


  8. #8
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    Default Re: Spare Fueltank - Leaking Caps

    Quote Originally Posted by John Allan View Post
    Hi,

    That looks like a cap from a hydraulic oil tank and has a built in breather. It is not suitable for fuel.
    Why not? What's the difference between diesel and hydraulic oil?

  9. #9
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    Default Re: Spare Fueltank - Leaking Caps

    The caps fitted to hydraulic oil tanks have high capacity breathers built into them to allow for the high flow rates of the hydraulic oil in the systems. Fuel, and especially petrol, is much more volatile than hydraulic oil. You are always going to get a lot of vapors and fumes coming through the cap. I suspect that the leak you see is vapors that have settled around the cap. This is also a safety risk.

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