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CCV Fuel Tank questions

Discussion in 'Motorsport / Trials' started by RichardIStone, Mar 29, 2016.

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  1. RichardIStone

    RichardIStone Member

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    All, I bought an ALRC log booked 88in trialer last year, it had it's first detailed scrutineering session earlier this month and one issue was the lack of external vent on the fuel tank. I've attached a few photos but my understanding is that I need to seal the fuel filler cap so that it does not vent and then add an external vent pipe with a non-return valve. All thoughts welcome, especially if they come with part numbers or links to the bits I'll need! :)
    P1020151.JPG P1020152.JPG P1020153.JPG
    Many thanks in advance.

    Richard Stone
     
  2. dandit1200

    dandit1200 Active Member

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    Try theok 4x4 Cheltenham
     
  3. dandit1200

    dandit1200 Active Member

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    Or try wkd 4x4 off road solutions they really good matt dillon has been well help full.
     
  4. RichardIStone

    RichardIStone Member

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    Thank you
     
  5. jai_landrover

    jai_landrover Well-Known Member

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    Richard all you need is a ball bearing and a brake pipe fitting. My cap has a pipe fitting attached and a ball bearing in so when you roll the ball drops and seals. When your righted the. Ball bearing allows air in so the tank doesn't collapse.
     
  6. dandit1200

    dandit1200 Active Member

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    In t
    In that case what about a motor cross tank breather the after market ones with the none return valve built in for that exact reason to stop fuel leaking one you when you crash .my yamaha yz has one fitted as standard .The bike is buried in the workshop ill try get it out an take a pick .surely you could attach my pipe to the breather pipe some how with a reducer and then you have a one way valve .eBay sell them for less than 5er. Feel a numpty for not thinking if it before.
     
  7. dandit1200

    dandit1200 Active Member

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    Screenshot_2016-04-08-00-43-11.png Bit more than a fiver then but that's the first one I looked at
     
  8. dandit1200

    dandit1200 Active Member

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  9. RichardIStone

    RichardIStone Member

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    Thank you, that sounds simple, can you let me see a photo? The brass tube on the underside of my filler cap does have a ball in it held up with a spring. I'm not sure what the black tube does, that has a mesh inside I think.
     
  10. jai_landrover

    jai_landrover Well-Known Member

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    To be fair the aluminium non return one way valve above seems an easy fix for £3
     
  11. dandit1200

    dandit1200 Active Member

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    And it looks cool .....I'll be needing stuff like this for my winch challenge truck I'm building (comp bug) soon as I have finished the series 2a
     
  12. jai_landrover

    jai_landrover Well-Known Member

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    Umm bling is usually heavy,

    CCV and comp safari keep the weight down.
     
  13. jai_landrover

    jai_landrover Well-Known Member

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    How did you get on with the one way valve??

    I've just removed one from a CCV tank as it totally screwed with the mixture expecially at idle on a hot day with fuel expansion plus the hot fuel returning from the carbs warm. I had to junk it in favor of a roll over ball valve.
     
  14. RichardIStone

    RichardIStone Member

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  15. jai_landrover

    jai_landrover Well-Known Member

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    Thats the correct type anyway. The simple one way valves are not ideal as the tank cannot breath. I don't think it will do much on an EFI anyhow but it deffo pressurised the tank and threw loads of extra fuel in when warm very noticeable at tick over after a run or warm day.

    I also had issues with the pickup pipe being at the rear corner i did a roundabout and it run out of fuel. So we fixed that aswell it still had 2 gallons of fuel in. This is a new to me second hand motor just sorting the niggles its had put on it over the years. No CCV booked yet but Its road legal so will take it for a spin at some point, either a CCV or laying out the next local one.
    .
     
  16. jai_landrover

    jai_landrover Well-Known Member

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    Well the national Comp safari is booked @owl
     
    owl likes this.
  17. Rougharse Racing

    Rougharse Racing Well-Known Member

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    The ball bearing in the copper tube in your cap is the non-return valve.
     
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