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Projects Gas tank vent, what is that??

Discussion in 'The Hokey Ass Message Board' started by miki562, Apr 21, 2017.

  1. Steffen Jobst
    Joined: Sep 16, 2016
    Posts: 1,993

    Steffen Jobst

    @miki562 :
    Get a vented fuel cap and you don't need to make tubes, filters etc.
  2. Steffen Jobst
    Joined: Sep 16, 2016
    Posts: 1,993

    Steffen Jobst

    Isn't that what we are all dreaming about?
    54vicky and 1927graham like this.
  3. 5window
    Joined: Jan 29, 2005
    Posts: 7,968


    Only if your filler cap is outside the trunk. Not everyone's is.
    54vicky likes this.
  4. stimpy
    Joined: Apr 16, 2006
    Posts: 3,547


    then newer gas caps have a one way valve in them for emmisions so when the evap system is not being purged , it will allow take up air in but no vapors out . it has to be for a 76 and later vehicle so the cap threads might be a problem , but on the older ones a exterior vent is prefered . make sure you put 2-3 loops in the line as it will also help control vapor bleed off . I have built several cars were it had a charcoal canister on it hooked up to control the gas smell in the guys garage , its a simple line to control the purge valve and line to the carb port and the thermal switch . hardest part was hiding the canister and running the lines so they wouldn't attract attention , but make them polished hard lines and no one notices them . .
  5. crazzywolfie
    Joined: Apr 16, 2017
    Posts: 18


    i am kind of surprised you have not had any issues with your tank without a vent. some idiot that owned my truck before me plugged the fuel tank vent and on 1 hot day the pressure that built up in the tank forced gas into the engine and filled the entire engine full of gas. all that headache was caused by the tank not being able to vent. unplugged the vent line and never had an issue since. i know it was pretty confusing to me when i was pulling the carb and fuel just kept pumping out the line with the engine off.
  6. Steffen Jobst
    Joined: Sep 16, 2016
    Posts: 1,993

    Steffen Jobst

    That's right. Sorry, I didn't consider this case.
  7. sunbeam
    Joined: Oct 22, 2010
    Posts: 5,163


    Battery boxes need to vented to the outside too.
    Steffen Jobst likes this.
  8. rer_239
    Joined: Jan 6, 2006
    Posts: 190


    so all i need to do is add a tube with a loop higher than the tank and run the tube out the floor with a gas filter on the end to my unvented tank.
  9. TagMan
    Joined: Dec 12, 2002
    Posts: 6,102


    In theory, yes, but you also have to plan for gas fumes and leakage in the event of a roll over accident. Exploding fumes in a garage or burning to death in a crash aren't cool !

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