Fuel tanks

Discussion in 'Bubba's Outboards' started by fwmud, Aug 23, 2005.

  1. fwmud

    fwmud New Member

    Messages:
    693
    State:
    Wilson's Mills,nc
    Bob concerning boat fuel tanks,both portable and mounted ones;
    Is there a guideline as to which must be vented and which are not vented?

    My old boat with a johnson outboard w/ portable tanks, was not vented thru a screw plug in the cap.
    The Merc I have now w/ a portable tank, has a vent screw in the cap.
    Can you explain the differences?
    Thanks
     
  2. Bobpaul

    Bobpaul New Member

    Messages:
    3,039
    State:
    Supply NC
    Keith, either you have a vented cap or a screw type vent in the cap. As for inboard tanks, they have a vent line to the hull with a thru-hull vent. As gas is used up, air pressure in the tank is equalized through a vent to prevent a vacume.

    I gave Mark a thru-hull vent for his next boat when we were in Ga. Do you need one too?
     

  3. Mark J

    Mark J New Member

    Messages:
    9,407
    State:
    Four Oaks, NC
    Bob, yes he does. His intentions are to put an aluminum tank below the sole.
    Keith, it has to be vented overboard.
     
  4. Bobpaul

    Bobpaul New Member

    Messages:
    3,039
    State:
    Supply NC
    Not a problem at all. Consider it done.