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Fuel Clunk Line too rigid?

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Old 02-26-2012, 06:25 AM
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Textanker
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Default Fuel Clunk Line too rigid?

How do you keep the fuel clunk line from getting rigid? Does it just need to be replaced every once in a while? I assume this is an effect of it being in gas?

Thanks!
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Old 02-26-2012, 06:47 AM
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Default RE: Fuel Clunk Line too rigid?

i change the tank lines yealry.... and the carb line and vent after a couple of years
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Old 02-26-2012, 09:07 AM
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Default RE: Fuel Clunk Line too rigid?

More an effect of lesser quality Tygon AND being allowed to dry out.
Leaving some fuel in the tank often allows the better Tygon to stay flexible longer.

If ya stick with Tygon, this is the best version of it.....

Tygon F-4040-A
http://www.amazon.com/gp/product/B00...BV5MD3R12GP5FT


....should last a lot longer than other types of Tygon.

Better idea is to take a step up and use.......

Genuine "Viton".......
http://www.redaerorc.com/accessories.html


-also-

Viton® Fluoroelastomer.....
http://www.mcmaster.com/#viton-fluor...tubing/=gf26cj


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Old 02-26-2012, 02:01 PM
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Default RE: Fuel Clunk Line too rigid?

+1
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Old 02-26-2012, 09:13 PM
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Default RE: Fuel Clunk Line too rigid?

++
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Old 02-27-2012, 08:56 AM
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Default RE: Fuel Clunk Line too rigid?

Viton is the way to go. Red Aero sells it as well
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Old 02-27-2012, 09:01 AM
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Default RE: Fuel Clunk Line too rigid?

Yep, tons of places to buy 'Viton', but folks need to remember to NOT use neoprene.
Crappy versions exist that could rain on your parade.
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Old 02-27-2012, 09:56 AM
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Default RE: Fuel Clunk Line too rigid?

I have a YAK 55M 50cc I'm putting together and I have been reading about the fuel line that Taildragger is selling in his shop. It's blue and I believe it may be Viton but I'm really not sure but I thought I might try it on my new gasser. Anyone know anything about the blue fuel tubing I talking about?
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Old 02-27-2012, 10:04 AM
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Default RE: Fuel Clunk Line too rigid?

Afaik, true 'Viton' comes in black only.

Maybe what tdrc has is like this?.....
http://www.usplastic.com/catalog/def...lickid=popcorn
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Old 02-27-2012, 11:09 AM
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Default RE: Fuel Clunk Line too rigid?


Quote:
ORIGINAL: a1pcfixer

Afaik, true 'Viton' comes in black only.

Maybe what tdrc has is like this?.....
http://www.usplastic.com/catalog/def...lickid=popcorn
http://www.taildraggerrc.com/gas-eng...cessories.html this one looks like aerotrend tubing
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Old 02-27-2012, 03:13 PM
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Default RE: Fuel Clunk Line too rigid?

I've used two of these for the last two months of the season. They seem to work as advertised and we will have to see how they perform after this season. The down line and inverted performance are wonderful. I have a third in my new Aero Works 100cc Yak55 under way. They do have larger sizes not listed yet and you would have to call for them. They are a bit pricey, but if they keep me from rebuilding tanks for a few seasons or more,with no fuel dead sticks, for me it's worth it.
Gregg

http://www.jlproducts.net/ProductRotoFlow.html


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Old 02-29-2012, 08:07 AM
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Default RE: Fuel Clunk Line too rigid?


Quote:
I have a YAK 55M 50cc I'm putting together and I have been reading about the fuel line that Taildragger is selling in his shop. It's blue and I believe it may be Viton but I'm really not sure but I thought I might try it on my new gasser. Anyone know anything about the blue fuel tubing I talking about?
I understand that this blue line from Traildragger RC that you are referring to is called Tygothane - a type of polyurethane compatible with biodiesel, as listed at McMaster-Carr, which also sells it. It remains flexible for a number of years and is certainly better than conventional Tygon, but it's not as good and long lasting as Viton. Your best options are, in that order: Viton > Tygothane > Tygon.



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Old 02-29-2012, 08:16 AM
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Default RE: Fuel Clunk Line too rigid?


Quote:
ORIGINAL: Beavis

I understand that this blue line from Traildragger RC that you are referring to is called Tygothane - a type of polyurethane compatible with biodiesel, as listed at McMaster-Carr, which also sells it. It remains flexible for a number of years and is certainly better than conventional Tygon, but it's not as good and long lasting as Viton. Your best options are, in that order: Viton > Tygothane > Tygon.
+1!
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Old 02-29-2012, 09:35 AM
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Default RE: Fuel Clunk Line too rigid?

I have been using Hayes Products seamless molded neoprene for 24 years...Maybe Arizona gas doesn't have the additives in it that some other states' gas does...I have it in my test stand gas tank...i hardly ever replace it...the small diameter (less than 1/8) worked just fine on a 300cc EVO I worked on....I have not seen any problems with degrading or swelling...It needs no zip ties or wire even on a straight piece of brass tubing...If you want to try a piece PM me with your address..
It is the most flexible tubing you can use in a tank, it never gets hard....
Your mileage may vary, I will use nothing else in my planes or test stand tank...
And it WILL fall forward in the tank in a crash....
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Old 02-29-2012, 09:53 AM
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Default RE: Fuel Clunk Line too rigid?

Nah, neoprene is at the bottom of my list.[X(]
Actually, it's not even on my list.
But good luck to you with yours, I won't go there.[8D]

Viton all the way!
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Old 02-29-2012, 10:00 AM
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Default RE: Fuel Clunk Line too rigid?


Quote:
ORIGINAL: Antique

I have been using Hayes Products seamless molded neoprene for 24 years...Maybe Arizona gas doesn't have the additives in it that some other states' gas does...I have it in my test stand gas tank...i hardly ever replace it...the small diameter (less than 1/8) worked just fine on a 300cc EVO I worked on....I have not seen any problems with degrading or swelling...It needs no zip ties or wire even on a straight piece of brass tubing...If you want to try a piece PM me with your address..
It is the most flexible tubing you can use in a tank, it never gets hard....
Your mileage may vary, I will use nothing else in my planes or test stand tank...
And it WILL fall forward in the tank in a crash....
The Hayes is great, and neoprene fuel line has been used for years in the auto industry, but like everything else there are cheap imitations. I picked up a 100' of Tygothane for $30 on ebay.
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Old 02-29-2012, 10:10 AM
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Default RE: Fuel Clunk Line too rigid?


Quote:
ORIGINAL: raptureboy

The Hayes is great, and neoprene fuel line has been used for years in the auto industry, but like everything else there are cheap imitations.
Very true.
Also true is it's automotive uses are primarily restricted to areas like vacuum hoses, radiator overflow lines, wiper squirter lines, and so on.
It's very rare now days to see neoprene anywhere near gasoline on a modern car/truck. Must be a very good reason for all those steel fuel lines, besides high pressure fuel injector systems.

When I raced cars in the 70's neoprene was great for siphoning gas though.[X(]

Quote:
I picked up a 100' of Tygothane for $30 on ebay.
It'll be interesting to see how that turns out.....flexibility over time, etc.
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Old 02-29-2012, 05:12 PM
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Default RE: Fuel Clunk Line too rigid?


Quote:
ORIGINAL: Zippi

I have a YAK 55M 50cc I'm putting together and I have been reading about the fuel line that Taildragger is selling in his shop. It's blue and I believe it may be Viton but I'm really not sure but I thought I might try it on my new gasser. Anyone know anything about the blue fuel tubing I talking about?
Yup....good stuff except it is a bit thick walled and stiffer than necessary because of the wall thickness. It isn't viton; it's ester based polyurethane good for gasoline

Go to McMaster Carr and look up polyurethane tubing for Biodiesel. I've written about this stuff many times before. You want the 1/8" x 1/32" wall. I've had mine in place for 3 years now and the material is as flexible as when new, inside the tank or out. It's less than 1/10 the cost of viton. Viton is bullet proof but this stuff seems to be just as good and is more flexible.

And BTW, make sure you look up the stuff good for Biodiesel; you don't want the material good for water, which is ether based
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Old 02-29-2012, 05:18 PM
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Default RE: Fuel Clunk Line too rigid?

Quote:
ORIGINAL: raptureboy


Quote:
ORIGINAL: Antique

I have been using Hayes Products seamless molded neoprene for 24 years...Maybe Arizona gas doesn't have the additives in it that some other states' gas does...I have it in my test stand gas tank...i hardly ever replace it...the small diameter (less than 1/8) worked just fine on a 300cc EVO I worked on....I have not seen any problems with degrading or swelling...It needs no zip ties or wire even on a straight piece of brass tubing...If you want to try a piece PM me with your address..
It is the most flexible tubing you can use in a tank, it never gets hard....
Your mileage may vary, I will use nothing else in my planes or test stand tank...
And it WILL fall forward in the tank in a crash....
The Hayes is great, and neoprene fuel line has been used for years in the auto industry, but like everything else there are cheap imitations. I picked up a 100' of Tygothane for $30 on ebay.
That's the correct material from McMaster Carr if the size was right. Except McMaster sells it for 25c per foot at 100 feet or more and 30c /ft for less than 100 feet. Reminds me I need to re-order some

Antique, this stuff will fold into a pretzel in a crash. LOL
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Old 02-29-2012, 06:36 PM
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Default RE: Fuel Clunk Line too rigid?

So ? What good is the rest of the crashed airplane anyway ?
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Old 03-01-2012, 09:38 AM
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Default RE: Fuel Clunk Line too rigid?


Quote:
ORIGINAL: Antique

So ? What good is the rest of the crashed airplane anyway ?
Damifino....was commenting on your comment...We were both poking fun. But since I had to explain it, it became used Juicy Fruit
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Old 03-02-2012, 08:08 AM
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Default RE: Fuel Clunk Line too rigid?


Quote:
ORIGINAL: raptureboy

I picked up a 100' of Tygothane for $30 on ebay.
Got a link to that?
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Old 03-03-2012, 06:45 PM
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Default RE: Fuel Clunk Line too rigid?

Anyone willing to sell a foot or two of viton?
I'd like to try it inside the tank and can't find anything under 10'

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Old 03-03-2012, 07:51 PM
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Default RE: Fuel Clunk Line too rigid?


Quote:
ORIGINAL: OliverJacob

Anyone willing to sell a foot or two of viton?
I'd like to try it inside the tank and can't find anything under 10'

2' -or- 6'.......
http://www.gravesrc.com/SearchResult...x=0&Search.y=0
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Old 03-03-2012, 07:56 PM
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Default RE: Fuel Clunk Line too rigid?


Quote:
ORIGINAL: a1pcfixer


Quote:
ORIGINAL: raptureboy

I picked up a 100' of Tygothane for $30 on ebay.
Got a link to that?
Guess not.
Must have been many years ago, because current pricing for 100' is $64.00, not $30.00
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