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Gasoline Clunk tube?

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Old 01-21-2012, 05:04 AM
  #1
phatbob02
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Default Gasoline Clunk tube?

Can someone point me to a source for a flexable fuel line to be used for a clunk line with gasoline?
Thanks!!
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Old 01-21-2012, 05:22 AM
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Default RE: Gasoline Clunk tube?

Go to any small engine repair shop (like a lawn mower repair) and get gasoline proof line. Also get the large felt lined clunks, they will soak up the last drop from the tank and deliver it to the engine.
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Old 01-21-2012, 05:36 AM
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Default RE: Gasoline Clunk tube?

Because most of us are cheap and it costs more than Tygon, in tank line some are using the lastest and greatest.... VITON.

It is not that expensive and available thru Mcmaster carr. Try a search on here for more specfic info if you want to give it a try.

Reportedly stays flexible longer than Tygon.

As for Tygon, both Dubro and Sullivan sell it available at your Local Hobby Shop. Most online hobbies have it too.

Remember to have a gas compatible stopper as well.
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Old 01-21-2012, 05:54 AM
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Default RE: Gasoline Clunk tube?

http://www.mcmaster.com

PN 5102K111

Here's the clunk http://www.theoempartsstore.com/prod...productid=3900
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Old 01-21-2012, 06:34 AM
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Default RE: Gasoline Clunk tube?

+1 on the Viton, but most of us start out with good old Tygon (Oregon is another brand of the same stuff).
Tygon & Oregon are often both available locally at your small eng repair shops (chain saws/edgers/trimmers/etc).

The felt clunk is one choice, another are these.....

Poulan clunk/filter part # 530095646

.

....both styles will drain nearly every last drop of fuel from your tank.
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Old 01-21-2012, 12:22 PM
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Default RE: Gasoline Clunk tube?


Quote:
ORIGINAL: phatbob02

Can someone point me to a source for a flexable fuel line to be used for a clunk line with gasoline?
Thanks!!
McMaster Carr part # 5549K44. One tenth the cost of Viton and works great in this application. This is the same chemistry as you would find in a small engine shop, except it has a thinner wall and is much more flexible. You have options

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Old 01-21-2012, 01:35 PM
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Default RE: Gasoline Clunk tube?

I have found that keeping the tank partially filled with gas helps to keep the in tank Tygon plumbing lines flexible for a much longer time than when the tank is kept empty when not in use.

Karol
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Old 01-21-2012, 07:23 PM
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Default RE: Gasoline Clunk tube?

This seems to work fine too.

http://www3.towerhobbies.com/cgi-bin...P?I=LXD735&P=8
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Old 01-21-2012, 08:18 PM
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Default RE: Gasoline Clunk tube?


Quote:
ORIGINAL: Clay Walters

This seems to work fine too.

http://www3.towerhobbies.com/cgi-bin...P?I=LXD735&P=8

That's neoprene...very, very bad!!!!
If it hasn't (yet) deteriorated, it most certainly will!
Do NOT use neoprene with your gas!!!

Tygon, Oregon, or Viton are the accepted brands to use with gas!
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Old 01-22-2012, 08:23 AM
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Default RE: Gasoline Clunk tube?


Quote:
ORIGINAL: Clay Walters

This seems to work fine too.

http://www3.towerhobbies.com/cgi-bin...P?I=LXD735&P=8
That's neoprene tubing which is ONLY compatible with NON ethanol blended gasoline.

Karol
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Old 01-22-2012, 01:11 PM
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Default RE: Gasoline Clunk tube?


Quote:
ORIGINAL: a1pcfixer


Quote:
ORIGINAL: Clay Walters

This seems to work fine too.

http://www3.towerhobbies.com/cgi-bin...P?I=LXD735&P=8

That's neoprene...very, very bad!!!!
If it hasn't (yet) deteriorated, it most certainly will!
Do NOT use neoprene with your gas!!!

Tygon, Oregon, or Viton are the accepted brands to use with gas!
a1pcfixer, Have you personally experienced this or are you just repeating the conventional wisdom on this matter. Several years ago on the first really cold day of the winter the clunk in my plane stopped clunking, it was stiff as a board (tygon). I had some of the Dubro neoprene in my drawer so I cut off several inches and placed it in a jar of my fuel. After five weeks it was still like new so I replaced the clunks in both of my 50 cc planes. It is now 2+ years later and I have not seen any sign of deterioration, no problems of any kind. Maybe the ethanol in Oregon is not as potent as the stuff in you area..........RJ
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Old 01-22-2012, 02:39 PM
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Default RE: Gasoline Clunk tube?

http://www.ebay.com/itm/ECHO-OEM-FUE...item3eede14d75 best clunks hands down... they will suck your tank dry and also minimize any chance of sucking air
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Old 01-22-2012, 03:28 PM
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Default RE: Gasoline Clunk tube?

Note,

Not compatible with greater than 10% ethanol fuel

There are rumors of it going to 15% around here, so that felt clunk will fall apart.   I use a bronze sintered clunk instead. works quite well.
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Old 01-22-2012, 03:45 PM
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Default RE: Gasoline Clunk tube?

In my RC models no, in automotive 1/4 mile racing yes.

I value my stuff a bit more than to use neoprene that will eventually deteriorate and end up with particles in my carb. No thanks!
With thousands and thousands of chain saws, edgers, trimmers, etc., being sold with Tygon/Oregon tubing, you might consider they most certainly know better than to use neoprene. No need to reinvent the wheel, but you do what feels good for you.

There's very good reasons it's called conventional wisdom.
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Old 01-22-2012, 04:43 PM
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Default RE: Gasoline Clunk tube?

Quote:
ORIGINAL: a1pcfixer

That's neoprene...very, very bad!!!!
If it hasn't (yet) deteriorated, it most certainly will!
Do NOT use neoprene with your gas!!!

Tygon, Oregon, or Viton are the accepted brands to use with gas!

The right type of neoprene composition will not deteriorate, try Hayes seamless, I believe that is the good one.

RCIgnition has has some in one of his bench tanks for many years without any problems to date.............
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Old 01-22-2012, 04:48 PM
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Default RE: Gasoline Clunk tube?

Read the post above yours. I know better and will NOT go there.
You do as you please.
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Old 01-22-2012, 05:01 PM
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Default RE: Gasoline Clunk tube?

Saying you know better when others have never had a problem when using neoprene type fuel tubing is presumptuous, just as not all "tygon" type fuel tubing is the same, I have had some of that knock off tygon crap that went stiff in a week.
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Old 01-22-2012, 05:13 PM
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Default RE: Gasoline Clunk tube?

Presumptuous? lol

No, it's experience that teaches me to rightfully claim I know better.
Others in my club tried neoprene to their dismay, and my experiences mirror theirs.

Nope, no way will I ever use such when there's far better available.
To each their own, ymmv, yada, yada.
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Old 01-22-2012, 06:24 PM
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Default RE: Gasoline Clunk tube?


Quote:
ORIGINAL: acdii

Note,

Not compatible with greater than 10% ethanol fuel

There are rumors of it going to 15% around here, so that felt clunk will fall apart. I use a bronze sintered clunk instead. works quite well.

where did you read that felt will fall apart after 10% ethanol?

Permanent felt markers have more volatile chemicals in them and they hold up fine
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Old 01-22-2012, 06:29 PM
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Default RE: Gasoline Clunk tube?

Yep, I only run walbro/chainsaw felt clunks and our gas has had 10% etho for many years now, no problems to date.
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Old 01-22-2012, 09:30 PM
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Default RE: Gasoline Clunk tube?


Quote:
ORIGINAL: RTK

Saying you know better when others have never had a problem when using neoprene type fuel tubing is presumptuous, just as not all ''tygon'' type fuel tubing is the same, I have had some of that knock off crap that went stiff in a week.
Neoprene works great in ANY gasoline application BUT, it must be formulated correctly. Hell until very recently, gas lines to the car carburetor were neoprene.
What APC1fixer is saying is that there are all kinds of neoprene formulation out there and some will not work. I had a recent (3 years ago when I came back to gassers) experience with LHS neoprene stock. After two months the stuff cracked at the fittings. That formula was junk

Viton is bullet proof but is pricy.

Tygothane (TPU), aka Oregon, is the stuff you often get at small engine shops and it works great too. But is a bit thick and stiffer than you want inside thetank. The ester based tygothane for biodiesel is what I found at McMaster Carr and gave the part no above. The wall is thinner on this material making is more flexible inside the tank. Try it. It's what I've used for the past 2+ years now and the material is still like new, inside and out...

Good luck either way
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Old 01-23-2012, 02:53 AM
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Default RE: Gasoline Clunk tube?


Quote:
ORIGINAL: MTK

What APC1fixer is saying is that there are all kinds of neoprene formulation out there and some will not work. I had a recent (3 years ago when I came back to gassers) experience with LHS neoprene stock. After two months the stuff cracked at the fittings. That formula was junk

Viton is bullet proof but is pricy.

Good luck either way
Exactly right! +1

The defacto std fuel lines used by the majority of us is Tygon (Oregon same stuff), with Viton highly desired, followed by a few still trying neoprene.
Not a great idea to suggest neoprene to the new users, when they'll not likely know which is good or bad, better to recommend the proven std Tygon.
There's a specific Tygon that some like best, and has a number printed on it (4140???) maybe someone remembers the exact number?
Keeping a little gas in your tank does indeed help in keeping it pliable, but changing it at the start of each new flying season is also good advice!

There's numerous postings in several online forums of where users found particles of neoprene in the carb screens.
So I'll stick with Tygon/Oregon, and maybe try out some Viton, but NEVER will I use neoprene!
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Old 01-23-2012, 03:18 AM
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Default RE: Gasoline Clunk tube?

My question is this. How much is to pricey?? We put thousands in our models and then complain about the price of a VERY important piece. No fuel no run. And where it stops running can be very important!

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Old 01-23-2012, 03:26 AM
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Default RE: Gasoline Clunk tube?


Quote:
ORIGINAL: skillet92

No fuel no run. And where it stops running can be very important!
So very true!
Cost cutting in and of itself can often turn around and bite ya!
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Old 01-23-2012, 04:32 AM
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Default RE: Gasoline Clunk tube?

I have been using a fuel line made for Tanaka chainsaws etc. for years and have yet have a line harden up.. I set my fuel can up with both tygon line and tanaka line and the tygon line got very stiff while the tanaka line remained extremely flexable. You can usually find this line a tractor store that sells parts or you can get a hold of me as I have lots of this line at home.
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