Venting

Discussion in 'Fuel and Air Systems' started by BRog, May 13, 2018.

  1. BRog

    BRog Member

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    I have an original 1971 Dart slant 6 vehicle which I which I swapped out for a 340 motor. When I swapped the motor, I removed the black canister under the hood which was part of the vent system.

    So now I have a 1/4” vent line that runs from tank to engine compartment and I’m not sure what to do with it. Should this just be capped and venting will occur through cas cap?
     
  2. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

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    No I don't think you can do that as your cap isn't vented. Maybe use a vented cap or a fuel neck out of a 70?
     
  3. 67Dart273

    67Dart273 Well-Known Member

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    NO MOPAR CAPS were vented. (At least the cars we are talking about here)

    The ones from 70 (CA) and onwards were "pressure vacuum" in other words a relief valve

    Either leave the 1/4" tube "up high" for a vent, or re-create the 69/ earlier vent in the fill tube. From there, earlier, the caps were sealed

    Go to MyMopar, download a 69 or earlier manual and a manual for your car. The setup is detailed either in the fuel section or "emissions"
     
  4. brian6pac

    brian6pac Well-Known Member

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    Vent? I vent at the bar with a couple buddy's and a lot of beer!
     
  5. pishta

    pishta I know I'm right....

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    plumb it into the air cleaner, that sucks!
     
  6. Mr Gorsky

    Mr Gorsky I know words, I have the best words...

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    Run that vent line back into the fuel filter. Wix 33054.

    This is what I have on my Demon:

    fuelfilterwix33054.jpg
     
  7. brian6pac

    brian6pac Well-Known Member

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    On the early cars they just vented to atmoshere. I would just run it up high so it wont leak fuel and vent it to atmoshere, or you could use it for a return line.
     
    • Agree Agree x 1
    • diymirage

      diymirage HP@idle > hondaHP@redline FABO Gold Member

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      I would put the charcoal canister back in and plumb it in properly...or park outside