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| vtsteam:
--- Quote from: PekkaNF on December 27, 2014, 01:09:03 PM ---On RC engines I think it was silicon tube for methanol and this "clear" PVC tube for gasoline. You were fine as long as you didn't mix. .. --- End quote --- Actually I'm talking control line days (for me) in the early 60's and there was no silicone tubing -- it was all clear vinyl fuel line, distributed by Perfect (brand name). It was also found inside Thimble Drome/Cox half-A engines in the built in radial mount fuel tank, and also what we used on the fuel pump from the can, or to connect an external tank to an engine. And that was all methanol/castor oil mix. The vinyl handled it - no problem. It was very helpful, too because you could see whether there was air in the lines, etc. Silicone fuel tubing is recent R/C. |
| PekkaNF:
Very likely, I was born middle 60's makes me a spring chiken to lot of you guys, but tat the work am't the grumpy old troll. Anyway, I was googling fuel pick up lines for inspiration and found quite a few ones made from nylon. The nylon type was not mentioned, but I have PA 12 pneumatic nylon tubing, it is pretty easy to find. I also have some pneumatic connectors, but they don't work well with uder pressure, therefore I would not use the standard fitings. Have to remove some parts and see where all that junk would fit best. I'm thinkking of giving a try this Oregon 07-258 (looks like it could be Tygon® F-4040-A Fuel and Lubricant Tubing) http://www.usplastic.com/catalog/item.aspx?itemid=23487 Alhough it's max. temp is very much less than I would hope. But there is tight spot and I have to see if this would fit there, if it does not then nothing will. Original is straight ruber line, more of stump than anything else. Pekka |
| PekkaNF:
OK, some progress VT and some others might be interested on this concept of fuel line unions to fuel tank: * Use on truck/tractor tubeless tire valve assembly See first picture, standard item has pretty much correct stem to popular 1/4" tubing, the thread part on the tip is about 7,6 mm, a tad small for standard 8 mm tubing. Good news is that they are readily available, pretty cheap (I walkked in first tire shop and they sold two 3€ apiece) and when the air valve is taken out it is all smooth bore. They had straigh stems, 90 degree, short ones, long ones, but I liked this small angle model. The interesting thing is that I just might be able to have the cake and eat it too, very soft fuel line might allow me to fit original tank and a quick fuel disconnect. Threre is only about 50 mm of linear distance of two fuel lines to snuggle. Rubber hose would not make that tight bend, but this Oregon fuel line just might. Only thing is that I need a bigger one than this 1/4" I have. See pictures two/three. Another complication is that I can't fit very well the filter assembly I have, it is just few centimetres too tall to maintain and use it properly. Darn. I don't want to tilt it, nor mount it to protrude out of the pipe frame at all and thre should be enough space around it when maintained in dark, rain, blizard or -30C and windy. On the other hand I want it as big as possible in filter area, because this has no transfer pump. I'll try to fit the original tank and injection pump with new diverted fuel lines and see if it looks doable, if it does, then I'll hook them up to an external filter that has aux fuel line disconnect. That would give me max. flexibility and if I get the filter height right, there should be no problem when bleeding it. It all would be a whole lot easier if I had fuel rubber line T with short end of 50 mm stump, I have seen them on car cooling systems, but never on fuel lines. Plan B is to take the original tank out and make a good use of the space where that orginal tank is. For this option an fixed tank would be great. I googled last night ready made tanks and there seems to be many possible ones in USA, but not that many in Europe. Pekka |
| Scuba1:
As far as filters go for diesel fuel. There is none better then the Racor cartridge filters. They have a clear bit at the bottom of the water separator, so you can see what is going on and you can get the insert cartridges from 4 to 10 microns. I have used them and use them on all my diesel engines. In a gravity fed system, you will want to install a ball type valve / tap, so you can shut the fuel flow when changing the insert cartridge. You can change them in under a minute with no tools. I have a dozen spares on board at all times. At Amazone you can get an filter that is identical to the Racor 500 FG at half the price of the original. Still use the original Racor insert filters with it though. They run at around 95 $us for a dozen. ATB Michael |
| PekkaNF:
Few experiments left...I have trouble locating reliable source/make of fuel line. I would like much PTFE lined line, but I don't need much pressure head and I would like to use hose spring clamps instead of whole lot bulkier AN fittings. Haven't found yet UK/EU source of teflon lined non metallic braided line. Is there a commonly available 5-8 mm ID PTFE lined fuel hose that can be used with normal fuel spring clamps? Thanks, Pekka |
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