dual fuel tank fill

Discussion in 'Boat Design' started by philcapper, Mar 3, 2013.

  1. philcapper
    Joined: Jul 2011
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    Location: Stecoah, NC

    philcapper Junior Member

    I am building a boat with 2 fuel tanks (gasoline). Can i use a single fill with a t?
     
  2. Submarine Tom

    Submarine Tom Previous Member

    You can but is it a good idea?

    Probably depends on the nature of the installation.

    Do you have any pictures of the project?
     
  3. philcapper
    Joined: Jul 2011
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    Location: Stecoah, NC

    philcapper Junior Member

    dual taks single fill

    i have pictures, but can't figure out how to insert them into the thread
     
  4. philcapper
    Joined: Jul 2011
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    Location: Stecoah, NC

    philcapper Junior Member

    I have saddle tanks and would like a single fill on the port side. I figure if I keep the "T" low enough It shouldn't be any different than filling a single tank. . Tank inlets are tight to the transom as are the pickups.. I'll send a couple of pix if zi can figure it out
     
  5. hamedhpt
    Joined: Jan 2009
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    Location: iran

    hamedhpt HAmed

    collector

    You can make a collector.Like the attachment.
     

    Attached Files:

  6. philcapper
    Joined: Jul 2011
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    Location: Stecoah, NC

    philcapper Junior Member

    here are some pix (I think)
     

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  7. tom28571
    Joined: Dec 2001
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    tom28571 Senior Member

    Not sure what you mean by "low enough" but I would never have any outlet or connection on the bottom of a boat fuel tank. Any problem there would flood the boat with fuel.
     
  8. Ike
    Joined: Apr 2006
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    Location: Washington

    Ike Senior Member

    Some simple rules apply to gasoline fuel tanks but one of the most important is no fittings are allowed below the top of the tank. This prevents fuel leaks. Most fuel leaks are from fittings, so if you have no fittings on the sides or bottom of the tank this eliminates potential leaks. This pretty much precludes having a connection low on the tank to fill them both from the same fitting.

    You can find out more about fuel tanks here. http://newboatbuilders.com/pages/fuel.html

    If you can devise a single inlet fill that then splits to go to both tanks that would work as long as they go to the tops of the tanks. But frankly it would be simpler to have two fills, one on each side of the boat.
     
  9. michael pierzga
    Joined: Dec 2008
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    Location: spain

    michael pierzga Senior Member

    Ike is correct. Not practical to use a single fill on two gasoline tanks.

    You could use one fill with a manifold with two valves... open port valve...fill port tank, close port valve.... open stb valve then fill stb tank.

    Sounds like trouble, too much plumbing and an easy way to make a mistake and spill gas.
     
  10. Stumble
    Joined: Oct 2008
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    Location: New Orleans

    Stumble Senior Member

    If you were going to do this I would think a three way valve would be a better option. At least that way there wouldn't be fuel caught in the area between the two valves. But frankly I don't see the advantage over having two fill caps.
     

  11. Submarine Tom

    Submarine Tom Previous Member

    Cheaper, fewer holes in the boat, less connections...
     
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