Sigg Firejet Fuel Line Refurbishment

Discussion in 'Fettling Forum' started by BMurr, May 8, 2015.

  1. BMurr

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    1431099391-Sigg_Pump_ConnectorE.jpg 1431099411-Sigg_KinkedE.jpg 1431099439-Sigg_prisingE.jpg 1431099458-Sigg_ConnectorsE.jpg 1431099475-Sigg_Disassembled_Line.jpg

    I have a Sigg Firejet which gave me great service in 1994 when I rode around parts of India on a motorcycle with my wife. Now with a teenage son that I'd like to take camping and hiking I'd like to resurrect this stove.I had to make up a washer to hold the leather cup in place for the pump and it works fine now. However I read that the rubber in the fuel line will likely have reached a point where it can crack and leak and even create a fireball, not the sort of thing I want happening on a camping trip. My fuel line was also heavily kinked, likely stressed internally and also likely restricted too as a result.The consensus seems to be that unless I can source the rare and hard to find replacement fuel line ( which will be old stock anyway and likely to suffer from age too) I should keep the stove as some sort of ornament. After a bit of frustrating headscratching and a botched attempt to separate the pump side brass connection into two pieces ( when in fact it is seemingly just one piece) which resulted in minor damage to the threads which doesn't affect functionality I have now separated the connectors from the fuel line. I used a screwdriver to prise the ferrules apart from the connectors, it was a relatively simple procedure. My next stage is source braided fuel line with internal diameter of 2 mm. I'll keep you posted on how I fare in getting that fuel line.
     
  2. Rickybob United Kingdom Banned

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    You have nailed the problem with the Firejet, they are all 22+ years old and spare parts are no longer made. A lot depends on the state of the jet too,
    I would get a whisperlite as it is much the same stove but with new seals and connectors and different pot supports, plus a warranty.

    Presscall for Moderator!
     
  3. Rickybob United Kingdom Banned

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    I forgot to ask what fuel you used in India, many people were dissapointed with the siggs 'one jet fits all fuels' approach and my sigg serves as a dusty keepsake in my den.(knackered jet!)

    I suggest you check out Presscall's work on the sigg in the reference section and i believe the pump seals are the same as MSR should you want to replace them.

    Presscall for moderator!
     
  4. BMurr

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    I used petrol as that's going to be in the motorcycles fuel tank anyway. It's a sentimental project so I'll see what I can do to fix it. There's a specialist hydraulic hose manufacturer in the city near me so I will call in there and see what they can supply. Nearest thing I've found online is braided brake hose for motorcycles so I don't think this is an impossible task. Hopefully I'll get this sorted and a few others can resurrect their firejets.

    I've seen presscalls adaptation of fuel line for simmering, however it involved moving up to a larger bore hose and some braising of new ends on the connectors, something beyond my capabilities.
     
  5. BMurr

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    Found this stuff available online. I've asked for a price. So at least now I know that what I seek does exist.


    2mm Dn2-450 bar PTFE Bore Stainless Steel Braided Microbore Hose
    SKU: TSHV2.0B01
    Price request
    Internal Diameter
    2mm
    External Diameter
    5mm
    Max Working pressure
    450bar
    Min Bend Radius
    20mm
    Temperature range
    -70°C to +260°C (pressure dependant over 130°C)
     
  6. theyellowdog

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    You might have problems finding a fitting that will crimp that small outer diameter.
     
  7. Chef BC

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    Looks like you have made far more progress than I have attempted, good on you! :thumbup:
     
  8. Rickybob United Kingdom Banned

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    i imagine the pipe suppliers will have suitable crimps and as the inner is teflon it will be flame proof and no doubt better than the original.

    i would like to use my firejet now and then if i could get a new jet but then i remember that it is one of those on or off stoves so it stays on the shelf.

    p.s. 'sig fire jet' on ebay uk ending 23.00 today sunday, aways handy to have a source of spares.

    Presscall for Moderator!
     
  9. BMurr

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    OK. Best local source I could find only did a cloth braided version, which I think would probably not be best and be damaged from the heat off the stove .

    So I bit the bullet and ordered from Hydrotechnik Uk ltd. Smallest order they could do was a metre length so they will cut that into 3 shorter lengths of 33cm and they will supply me with 6 crimps so that I can have enough to make up/repair 3 hoses. Postage is steep but thats to be expected as they are an industrial supply operation and not geared up for the likes of me. UK postage was £10 and the bits cost £13. Sure I could probably eventually pick a hose up from ebay or something similar eventually but it would still just be an old hose of dubious reliability. This way I get the hose back to as new condition as possible.I'll let you know how it fits, if anyone then wants the same item I could sell off one or two of the spare hoses.
     
  10. BMurr

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    Well, I finally received three one foot long fuel lines. They fit fine, only problem is that the supplier forgot to include the ferrules/crimps with them. So I'll have to wait a bit longer now for them to arrive. The lines are not as flexible as the old rubber one and the PTFE inner is quite thick but all diameters still remain the same, in fact the cross section appears identical with PTFE being substituted for rubber.
     
  11. BMurr

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    Well ferrules did arrive, now away for guy to get another guy to do a favour and get them crimped. I always worry though that in situations like this that they'll be screwed up but fingers crossed and we'll see what happens
     
  12. BMurr

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    Oh dear, got the hose and ferrules back, uncrimped. Turns out the man with the tools was reluctant to crimp as feared damaging what he saw as a fragile setup. He even was told that there would be no comeback to him and to crimp it anyway but he declined. So my next step is to wait until I see a 4 jaw chuck going cheap somewhere and also to check a wire rope firm in case they have something.
     
  13. BMurr

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    We'll finally figured that I'd have a go with a tool that wad not ideal. I used a crimping tool which uses a hexagonal die. It doesn't crimp the whole furrule in one go, so I crimp to main body of connector and then again where the spigot is entering the hose. Seems to have worked, although I produced s leak at burner connection when I recrimped despite it having sealed fine first time. Anyway after cutting off crimp and putting another one on I have a fully sealed and functional hose. It's not ad flexible as the original rubber hose but that because of the ptfe being less flexible. Not sure how it will fare in long run but . Should try to use it regularly to test it out. Hopefully pics will upload from this phone but failing that I'll post from pc later.
     
  14. BMurr

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    Oh well, phone couldn't deal sigg tool e.jpg sigg tool head e.jpg sigg burner connection e.jpg sigg firejet in action e.jpg with upload of photos so here goes from PC
     
  15. Eddy Joon

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    Thanks for your information. This will save me a lot of time and lots of strugle.

    I just bought Sigg stove on Marktplaats because it is less powerfull than my Whiperlites and XGK II stoves. The Sigg is a bit an on/off stove but being less powerfull does mean I can "simmer" a bit better.

    It came in very dirty as it was used with kerosine. I cleaned the stove and it works wunderfull. It took me half an hour for the stove and half an hour for the kitchen and sink. I will replace the fuel-hose this winter.

    So Thanks.

    Eddy
     
  16. Radler

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    @Eddy Joon
    If you use a Fire-Jet stove you must decide what you want to do before you start the stove.

    If you want to melt snow or heath water for a whole party, you may pump up pressure as high as you can. But: If you want to simmer or cook rice, you better just pump as much as needed to make a blue flame. It may take two minutes longer to boil the water, but with low pressure you can simmer very well. You always can rise pressure, but you can't release it safely, so you must decide in advance.

    Best Regards
    Radler
     
  17. Eddy Joon

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    Thanks for your advice. This will be helpfull.

    BR
    Eddy