Primus 75 pump?

Discussion in 'Stove Forum' started by Kiwi NZ, May 28, 2017.

  1. Kiwi NZ

    Kiwi NZ Subscriber

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    That was the listing title for this pump that I have just purchased on line.

    primus 75 pump 1.jpg

    primus 75 pump 2.jpg

    I have no idea what it is for or what i am going to do with it, probably try and find the Primus appliance that it belongs to. does anyone know what this pump is meant to be used for?

    Thanks
    Geoff
     
  2. geeves

    geeves New Zealand Subscriber

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    cylinder of bits?
    Have you pullled it apart?
     
  3. Kiwi NZ

    Kiwi NZ Subscriber

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    No I saw it on Trademe and hit the buy now out of curiosity, yet to receive it.

    Geoff
     
  4. Robtz

    Robtz Subscriber

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    I, Geeves, and undoubtedly many others here, saw it, wondered the same and now wait for the big reveal ...
    Please post photos ...
     
  5. Caveman

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    Ditto Geoff,
    Nearly bought it myself, just out of curiosity. The curved knurled handle looks awkward to use but very deliberately made this way.
    Did Primus ever dabble with medical or scientific devices? Small inflatable toys?:-#
    Cheers
    B
     
  6. threedots New Zealand

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    That knurling appears to be on the shaft to provide a grip for a fitted wooden handle.

    A small air pump by the looks of it but for what?.
     
  7. Caveman

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    Yes! @threedots That makes sense. Possibly bakelite knob or handle?
    B
     
  8. theyellowdog

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    Syringe?
     
  9. Kiwi NZ

    Kiwi NZ Subscriber

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    Thanks Gentlemen, unfortunately due to a computer f.rt the payment did not go through first time so the pump has been posted but it is still on its way.
    It is a holiday weekend in NZ so it may not arrive until next Tuesday. will post as soon as it gets here.
    Geoff
     
  10. Kiwi NZ

    Kiwi NZ Subscriber

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    Well I have received the pump and my opinion is that it is the real deal. It is uniformly plated in what I assume is nickel and definatately looks like more than a collection of parts.
    this photo may show the plating a bit better.

    Pump with plating.JPG

    All the knurlnig is matching including on the business end.

    knurling on business end.JPG

    The pump washer is dry, hard and very clean looking, like it has never been oiled. It is also set up to suck rather than push.
    You can see the fraying on both edges as if it has a bit of use as it is.

    Washer reversed.JPG

    I don't think that the handle has ever had a bakelite or wooden part. The knurled bend is uniform, almost like a mandrel bend, and the plating is also uniform with no sign of being coated or having had anything removed from it.
    You can see that it is also hollow.

    knurling on handle.JPG

    Tube hollow.JPG

    Here is a shot of the end cap with the Primus 75 stamping.

    Primus 75 cap.JPG

    Here is a shot of the pump end from a different view, sorry the light is not the best for this shot.

    other end 2.JPG

    I am convinced that this a genuine Primus part with a dedicated purpose, although for the life of me I can't imagine what that could be.
    Hopefully someone here can come up with the answer to this question.
    I am thinking maybe I should also post on CCF, a wealth of knowledge there as well.

    Thanks Geoff
     
  11. theyellowdog

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  12. ArchMc

    ArchMc SotM Winner Subscriber

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    When it sucks up liquid, where does the liquid go? The way the leather pump bucket is arranged, it looks like it would just leak out the top of the pump around the shaft.

    ....Arch
     
  13. Kiwi NZ

    Kiwi NZ Subscriber

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    Maybe finger over the top of the handle tube drawing it up, finger off to let the pressure go and then push it down again and start over.
    I would imagine a dedicated syringe would have a seal that works both ways and a solid handle tube.
    Lots not right with this set up, someone will know.

    Geoff
     
  14. geeves

    geeves New Zealand Subscriber

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  15. ArchMc

    ArchMc SotM Winner Subscriber

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    I suppose it could be a syringe. I see now that the liquid would be sucked up below the leather bucket, if the end of the tube at the handle is blocked.

    ....Arch
     
  16. Ed Winskill

    Ed Winskill United States Subscriber

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    Ask Doc. There's a man who knows his syringes!
     
  17. ROBBO55

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  18. Tony Press

    Tony Press Australia Subscriber

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    Well spotted, Martin!
     
  19. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi Martin @ROBBO55, @Geoff Chirnside , well spotted indeed! If I had not seen your photos of the pump element of this design I would have had difficulty working out how it operated.

    Nowadays we would use a rubber bulb in the fuel line to prime the syphon (such as is used on an outboard motor with a separate tank).

    This earlier design should work just great, as after a few pumps natural flow should commence.

    Best Regards,
    Kerophile.
     
    Last edited: Jun 8, 2017
  20. Kiwi NZ

    Kiwi NZ Subscriber

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    Thank you Martin, amazing detective work, great spotting.
    I am now trying to imagine how it would be used, it is probably from a time when cars had direct access to the fuel tank and when they also used gasoline with out additives.
    It explains why the pump leather is so clean.
    I am wondering if perhaps the handle end is held, finger/thumb over the hollow end and ready to be inserted into the stove tank, hence the bent nozzle shape, maybe the body of the pump is worked to draw the fuel out of the car tank and once flowing left to flow into the stove tank.

    Probably it is now more useful to transfer fuel from a large container to a stove.
    It is a bit hit and miss using a funnel, trying not to spill any and also trying to stop pouring in time when full.

    Anyway I am pretty happy with my curiosity purchase, it will be interesting to see if anyone else has one of these lying around and wondering what it is for.

    Geoff