Optimus 111 - minimal fuel level...

Discussion in 'Stove Forum' started by gieorgijewski, Dec 10, 2019.

  1. gieorgijewski

    gieorgijewski Subscriber

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    o111b.jpg
    Tony's photo used...
    if "green" is secure max
    "red" is level beggining fuel pipe (+-)
    ------------------------
    is fuel below red line usable?
     
  2. Wim

    Wim Subscriber

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    I suppose a look through the filling opening will show a downward tube inside the fount, so most fuel in there can be used. I must confess I never checked this on my own 111s!
     
  3. gieorgijewski

    gieorgijewski Subscriber

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    yes - there is in tank - pipe - below pumps
    thanks
     
  4. SveaSizzler

    SveaSizzler United States Subscriber

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    The wick should drop below the red line and suck fuel up thru capillary action.
    I'd be more worried by overfilling.
    Also, isn't the stove self-pressurizing? With the heat radiating off the burner causing the fuel in the tank to vaporize -- so now in a gaseous state the vapor is being forced thru the nipple and up the burner for ignition.
    Not that I have an Eleventy-One, but if I ever do get one, I already have the OEM Optimus parts kit.
    [I also bought a gallon of kerosene lately. But that's for my Feuerhand lantern.]
     
    Last edited: Dec 10, 2019
  5. Tony Press

    Tony Press Australia Subscriber

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    @SveaSizzler

    The Optimus 111 does not have a wick.

    The fuel tube bends down towards the bottom of the tank. I’ve got one somewhere in the shed, disassembled from the tank. I’ll go hunt it out.

    Tony
     
  6. SveaSizzler

    SveaSizzler United States Subscriber

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    OK. Thanks Tony. I just assumed it was a bigger 8R, with a built-in pump.
    I should shut up about stoves I don't own.
    Could you add a wick, or would that impede fuel flow?
     
    Last edited by a moderator: Dec 10, 2019
  7. Tony Press

    Tony Press Australia Subscriber

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    They work perfectly well without a wick, and I prefer to use kerosene - so no advantage in a wick.

    These are one of the best stoves around.


    Cheers

    Tony
     
  8. Radler Switzerland

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    As long as vaporised fuel arrives in the burner, yes. It doesn't matter much, whether the fuel is vaporised after, or in, or before passing the wick. Of course it will not be possible to start the stove, when the wick is dry. And there will be little power, when only a hot tank helps to vaporise the last fuel.

    Radler
     
  9. OMC

    OMC Subscriber

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    Just peaking into tank reveals inlet tube dips much lower than red line.
    I see the pump >> on downward angle <<< so pump tube inside is much lower than pump knob.
    I see the fuel inlet tube disappears below the pump tube.
    I vaguely recall this being *demonstrated.
    It is my impression, the wonderful 111, has an inlet tube very near the bottom and it will burn fuel nearly to the last drop. Sorry I've found no *link nor example to share.
     
  10. Tony Press

    Tony Press Australia Subscriber

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    Slightly beaten-up, but this is an Optimus No. 111 internal-to-tank pump tube.

    It points down to the bottom of the tank:

    083A856E-D5DB-474D-B183-0719CFE5720B.jpeg

    It will go below the ‘red line’ in the diagram @gieorgijewski has posted above.


    Cheers

    Tony
     
  11. gieorgijewski

    gieorgijewski Subscriber

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    yes Tony - i was find it under pump tube...
    how yours was disasembled? by mistake or with premeditation?
     
  12. Tony Press

    Tony Press Australia Subscriber

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  13. rjh

    rjh United Kingdom Subscriber

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    The tip of the pick up tube is about 4mm from bottom of tank.

    IMG_20191211_102411.jpg IMG_20191211_102617.jpg
     
    Last edited by a moderator: Dec 11, 2019
  14. Tony Press

    Tony Press Australia Subscriber

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    @rjh

    Where’s that cutaway from?

    Tony
     
  15. rjh

    rjh United Kingdom Subscriber

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    111 B.

    Robert.
     
  16. Tony Press

    Tony Press Australia Subscriber

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    Robert

    I was more wondering whereabouts the cutaway was situated. I have a great fondness for pressure lamp and stove cutaways.

    Cheers

    Tony
     
  17. JP2

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    Wow guys , what a nice sharing. Thank