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Technical Fuel Tank Vent Question

Discussion in 'The Hokey Ass Message Board' started by Steves46, Feb 24, 2018.

  1. Steves46
    Joined: Sep 23, 2008
    Posts: 397

    Steves46
    ALLIANCE MEMBER
    from Florida

    Awhile back, I purchased a 15 gal plastic gas tank for my 55 and it has a threaded vent on top. Since I have a vented gas cap should I plug this or will it be ok to leave as is with nothing connected to it? Thanks.
    Tank.jpg
     
    chryslerfan55 likes this.
  2. choptop40
    Joined: Dec 23, 2009
    Posts: 3,584

    choptop40
    Member

    Plug it , it will vent...
     
  3. BJR
    Joined: Mar 11, 2005
    Posts: 6,345

    BJR
    Member

    Plug it or hook a hose to it and run it up the outside of the fill pipe with a "U" at the top.
     
    harpo1313 likes this.
  4. 4wd1936
    Joined: Mar 16, 2009
    Posts: 821

    4wd1936
    Member
    from NY

    BJRs idea of the hose with the U is good. I might suggest a filter on the end of the hose to keep dirt out and more important, the addition of a roll over valve at the tank vent outlet with the hose hooked to that. If somehow the car gets upside down you won't have fuel pouring out of the vent.
     
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  5. Steves46
    Joined: Sep 23, 2008
    Posts: 397

    Steves46
    ALLIANCE MEMBER
    from Florida

    Thanks for the feedback. I neglected to metion the 55 was a F-100 pick-up and the tank is below the running board. I think I will go ahead and plug it since my cap is vented.
     
  6. chevy57dude
    Joined: Dec 10, 2007
    Posts: 5,535

    chevy57dude
    Member

    Does this serve the same purpose as a rollover valve?
     
  7. No, if it is higher than the tank when the vehicle is on it's tires. When it's upside down,fuel will run out the vent. The vent hose would need to loop then run below the tank.
     
    chevy57dude likes this.
  8. Cree
    Joined: Jun 13, 2017
    Posts: 108

    Cree
    Member
    from Montana

    I unscrewed the “top” off the inexpensive remote rollover valve sold by Tanks Inc., added a hose barb, and put that assembly in-line in the vertical vent hose loop. The down leg drops out through the floor. Disclaimer: I haven’t tested it yet.
     
  9. Mr48chev
    Joined: Dec 28, 2007
    Posts: 26,883

    Mr48chev
    ALLIANCE MEMBER

    Gas will run out of the vented cap if you roll it anyhow unless it ends up laying with the gas tank filler higher than the tank. Main thing is that the tank is vented one way or the other or it becomes a vacuum container.
     
  10. trollst likes this.
  11. BJR
    Joined: Mar 11, 2005
    Posts: 6,345

    BJR
    Member

    I don't think you want the vent to go below the fuel level in the tank, or it may syphon the fuel from the tank.
     
  12. Blue One
    Joined: Feb 6, 2010
    Posts: 10,518

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Some vents have a rollover valve included in the design, like this one I installed in my RPU gas tank.
    458400_L_f00938a8-da13-410e-9226-24e95ed41726.jpg
     
    Ralphies54 likes this.

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