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#704880 - 08/13/17 3:58 pm Flexible fuel line  
Joined: Nov 2009
Posts: 2,031
Peter R Offline
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Peter R  Offline

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Joined: Nov 2009
Posts: 2,031
Netherlands
What type of flexible fuel line do you guys use on your bikes ? I use the Italian made semi transparant material of the Ariete brand, however this material becomes rock hard in a few months time.
I also used the black rubber Gates material, not very flexible, and looks ugly.
Is there any useable ethanol proof material on the market for this purpose ?
Your thoughts /experiences please.


Peter.
1974 Commando 850
1972 Trident T150T
1961 Goldie DBD34
1969 Benelli 250 sport special
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#704883 - 08/13/17 4:24 pm Re: Flexible fuel line [Re: Peter R]  
Joined: Dec 2004
Posts: 8,825
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,825
Scotland
I have gone back to using clear plastic pipe with the reinforcing weave, it will harden so I will need to change it every year but that's the fault of the ethanol, at least I can see what's going on. I have used some black pipe on my quad bike and it ending up in the carb and jets.

#704884 - 08/13/17 4:34 pm Re: Flexible fuel line [Re: Peter R]  
Joined: Sep 2004
Posts: 669
gunner Online content
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gunner  Online Content
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Joined: Sep 2004
Posts: 669
Farnham, Surrey, UK
I have recently started to use Tygon fuel lines and I'm very happy with the results.

Tygon is a brand name for a type of flexible polymer tubing which is resistant to most types of chemicals and is used in a wide varieties of industries.

The automotive version of Tygon is coloured yellow but is translucent so you can still see the fuel. As far as I'm aware it stays flexible indefinitely.

You can get Tygon fuel pipe on eBay, see This Link


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
#704888 - 08/13/17 4:56 pm Re: Flexible fuel line [Re: Peter R]  
Joined: Jul 2001
Posts: 12,015
Lannis Offline
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Lannis  Offline

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Posts: 12,015
Central Virginia
What's interesting to me is the related question "What type of fuel line clamps do you use on your clear fuel line"?

I'm getting really tired of the rough-looking, plastic-cutting, takes-up-space Worm Gear Hose Clamps that are almost universally used on these things.

I sometimes use Fuel Injection Line clamps, which are a little smaller, or Spring Clamps, which, however, are hard to get in the right size. The ultimate is a crimped clamp, BUT you only use those on connections which you don't expect to remove for a while, so that limits them a bit ....

Anyone have a favorite?

Lannis


OK, I admit it, I'm addicted to brake fluid.

But I can stop any time I want.
#704892 - 08/13/17 5:25 pm Re: Flexible fuel line [Re: Peter R]  
Joined: Sep 2004
Posts: 669
gunner Online content
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gunner  Online Content
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Posts: 669
Farnham, Surrey, UK
What I do is to fit angled spigots to the fuel taps similar to the ones below, when I need to remove the fuel tank, I simply undo the spigot nuts from the taps, this then avoids having to remove the fuel line & clamp from the spigot.

[Linked Image]

Regarding the fuel line clamps, much depends on how well the fuel line fits the carb inlet pipe or tank outlet spigot and they type of fuel line you have.

If you have a really close fit and a soft fuel line (e.g. Tygon), then the wire type spring clips will work well. If the fuel line fit is looser or the material is harder then you need stronger clamps such as jubilee clips.

Fuel line clamps are graded to fit certain fuel line outside diameters so its worthwhile finding the right size.


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
#704893 - 08/13/17 5:27 pm Re: Flexible fuel line [Re: Peter R]  
Joined: Aug 2001
Posts: 862
Dennis B Online content
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Dennis B  Online Content
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Joined: Aug 2001
Posts: 862
Annapolis, MD
I have gone through the whole gambit with fuel lines
about 10 years ago I started using motion pro grey fuel line
Great stuff, until they started putting 15% ethanol in the gas
then that stuff started to harden after about 2 years
I now use the stuff that looks and feels like silicone
it isn't cheep (IMHO) but seems to last
you can get it on eBay, comes in a few colors
on 2 of my bikes I don't use any clamps with this hose
I know some will disagree with this practice
but it seems very solid and no leaks
HTH
Cheers
Dennis B


Member # 182
'73 750 Commando
'72 Combat Commando
'71 Triumph Blazer
'69 Victors
'68 Starfire (Shooting *)
'51 Royal Enfield 250 'S'

#704899 - 08/13/17 6:16 pm Re: Flexible fuel line [Re: Peter R]  
Joined: Jan 2014
Posts: 1,553
reverb Online content
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reverb  Online Content
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South cone
...hi Dennis, those silicone fuel hoses did not worked for me; so seems that are more than one type.

#704918 - 08/13/17 9:27 pm Re: Flexible fuel line [Re: Peter R]  
Joined: Dec 2005
Posts: 522
BritTwit Online content
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BritTwit  Online Content

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Joined: Dec 2005
Posts: 522
Kansas City area
I use SAE J30R7 fuel line. Compatible with ethanol, diesel and unleaded fuel. I buff the lay line markings off with a scotchbrite pad. I gives a nice vintage look.

#704924 - 08/13/17 10:41 pm Re: Flexible fuel line [Re: Peter R]  
Joined: Aug 2005
Posts: 1,114
bodine031 Online content
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bodine031  Online Content
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melbourne florida
Oetiker crimp clamps Tygon fuel line

#704929 - 08/14/17 12:02 am Re: Flexible fuel line [Re: Peter R]  
Joined: Jul 2008
Posts: 10
fettlefart Offline
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fettlefart  Offline

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Palm Harbor, Florida USA

I've been using Helix Racing Fuel line for years. Never has hardened but the clear does slightly yellow. Like the other post said, it fits real snug with out a clamp but looks funny that way. I tend to like the non cutting oil - fuel line clamps from Coventry Spares.

#704943 - 08/14/17 7:02 am Re: Flexible fuel line [Re: Peter R]  
Joined: Oct 2007
Posts: 1,270
Wilfred Online content
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Nanaimo, B.C. Canada
I use black fuel line from the local automotive supply store. Like the look better than the " clear goes yellow and hard " line and have had no problems. However, I do not use any ethanol laced fuel as we have Chevron 94 without ethanol as well as Co op 91 or Shell 91 if I'm between Chevron stations. Life also improved when I purchased a 3 imperial gallon home market/general export tank for the T100 to give me more miles between fuel ups. Only time the T100 has ever seen ethanol fuel was when I ran out on a long trip with the original puny 2 1/2 US gallon tank. Seems that around here, quite a few stations offer no ethanol fuel. Lots of classic cars around this area as well.

Cheers, Wilf


"It's about the ride..."
#704953 - 08/14/17 10:37 am Re: Flexible fuel line [Re: Peter R]  
Joined: Apr 2015
Posts: 274
Dibnah Online content
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Dibnah  Online Content
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Posts: 274
UK
J30 R9 with mini-hose clamps, have to get the sizing right on the clamps, very narrow application range e.g. 12mm-14mm and 13mm-15mm.

At least four of my vehicles have suffered disintegrating fuel hose in recent years.

#704962 - 08/14/17 12:47 pm Re: Flexible fuel line [Re: Wilfred]  
Joined: Jul 2001
Posts: 12,015
Lannis Offline
Life member
Lannis  Offline

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Joined: Jul 2001
Posts: 12,015
Central Virginia
Originally Posted by Wilfred
I use black fuel line from the local automotive supply store. Like the look better than the " clear goes yellow and hard " line and have had no problems. However, I do not use any ethanol laced fuel as we have Chevron 94 without ethanol as well as Co op 91 or Shell 91 if I'm between Chevron stations. Life also improved when I purchased a 3 imperial gallon home market/general export tank for the T100 to give me more miles between fuel ups. Only time the T100 has ever seen ethanol fuel was when I ran out on a long trip with the original puny 2 1/2 US gallon tank. Seems that around here, quite a few stations offer no ethanol fuel. Lots of classic cars around this area as well.

Cheers, Wilf


I've improved the problem a bit by keeping about 50 gallons of non-ethanol stabilized fuel here at the house, so for short trips I'm generally fine.

But when I'm out for a week on one of the old bikes, I'm having to run 3 or 4 tanks of whatever I can find on the road through the bikes - non-ethanol fuel isn't generally available out where I need it, so they see a lot of ethanol

I don't see a solution to that ... maybe I could carry a little bottle of additive (like a 1950s two-stroke rider carrying a bottle of pre-mix oil with him; that's what we're reduced to these days by the overweening bureaucracy) and use some in every tank.

But I think I'll be fine if I continue filling the tank back up whenever I come home with "the real thing", running it some to get it into the lines and carbs, and letting it sit till the next ride with minimal ethanol and Marine Sta-Bil in the tank, lines, and carbs ....

Lannis


OK, I admit it, I'm addicted to brake fluid.

But I can stop any time I want.
#704963 - 08/14/17 12:59 pm Re: Flexible fuel line [Re: Peter R]  
Joined: May 2010
Posts: 2,538
TR6Ray Online content
BritBike Forum member
TR6Ray  Online Content

BritBike Forum member

Joined: May 2010
Posts: 2,538
Illinois, USA
I installed these fuel lines in April, 2015:

[Linked Image]

[Linked Image]

Here they are today, August 2017:

[Linked Image]

They have turned the typical orange-ish color, but they are still fairly soft and flexible. I can compress the line by pinching between finger and thumb. They will easily bend up and down without fear of cracking or splitting.

They have been continuously exposed to Shell V-Power gasoline with 10% ethanol, except that I dry out the fuel system during winter storage. You can see the color difference between the two lines. For this single carbureted TR6, I only use the left tap when running. The reserve is on the right hand side. I open that petcock on occasion, just to keep it movable.

This is Superthane Ether clear tubing, as suggested by KC in S.B., back in an earlier fuel line discussion. For a description of the materials, including the ferrules and crimper, click HERE. Scroll to the top of the linked thread for recommendations by others for their preferred fuel lines.

Ray


'64 TR6R Plus some Twins from other countries (U.S., Germany, Japan)
#704993 - 08/14/17 5:51 pm Re: Flexible fuel line [Re: Peter R]  
Joined: Jan 2014
Posts: 1,553
reverb Online content
BritBike Forum member
reverb  Online Content
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Joined: Jan 2014
Posts: 1,553
South cone
...hello Ray, how do you do (if you want) to put an inline filter there? I mean, cut the line and add clamps?

#705017 - 08/14/17 9:08 pm Re: Flexible fuel line [Re: reverb]  
Joined: May 2010
Posts: 2,538
TR6Ray Online content
BritBike Forum member
TR6Ray  Online Content

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Joined: May 2010
Posts: 2,538
Illinois, USA
Hello reverb,

If I ever felt a need for an in-line filter, I guess I could do that, but I don't believe in them. Adding two in-line filters would add four more potential leak points and would provide no benefit. There is a screen on each petcock, and another one on the banjo fitting at the float bowl. I have four old motorycles that I ride. None of them have additional in-line filters. This has never caused me a problem.


'64 TR6R Plus some Twins from other countries (U.S., Germany, Japan)
#705033 - 08/14/17 10:01 pm Re: Flexible fuel line [Re: TR6Ray]  
Joined: Aug 2005
Posts: 1,114
bodine031 Online content
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bodine031  Online Content
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Joined: Aug 2005
Posts: 1,114
melbourne florida
The last 4 yrs (I retired in 15) the shop I was at we have been testing ethanol % at least 1x a week only a few times did we see anything close to 10% mostly 4-19%. 1 Airhead & 4 Brits all have tygon fuel lines. It stays soft for years but will turn a rootbeer color after time. I run major brand unleaded regular in everything with Star-Tron in the vintage stuff. They all run fine. I do add some lead additive once in awhile in the BMW. PS all run just fine with NGK sparklers!!!!

#705054 - 08/15/17 12:46 am Re: Flexible fuel line [Re: Peter R]  
Joined: Aug 2001
Posts: 4,152
Mark Z Online content
BritBike Forum member
Mark Z  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 4,152
Owego, NY, USA
Like Wilfred, I've been using regularol' black automotive fuel line for about 40 years. Even after reading on the forum that ethanol-laced fuel can deteriorate the inside of the hose, I've been too lazy to change. I haven't noticed any crud in the float bowls (I run Miks, which have no filters on the inlets), or suffered any engine problems (that I know of).

I would really like to know if anyone has actually witnessed stuff coming off the inside of this kind of hose, or if this is a theoretical problem. The stuff is so cheap that I need some incentive to change. It does harden after a few years, but I keep a length of it on hand and change it as soon as starts to look worn.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
#705357 - 08/18/17 12:46 am Re: Flexible fuel line [Re: Mark Z]  
Joined: Aug 2005
Posts: 1,114
bodine031 Online content
BritBike Forum member
bodine031  Online Content
BritBike Forum member

Joined: Aug 2005
Posts: 1,114
melbourne florida
How about 16 yrs of inside the HD industry. A wheelbarrow full of EFI pressure regulators, the plastic clips softened blowing the regulator back off the module and no fuel pressure. Mucho non-CV and CV Keihin carbs, S&S "E&B" carbs, & Mikuni's full of black fuel line crumbs in the float bowls. Float bowls etched/eaten away. Low speed jets plugged up. Florida fuel is the worst in the country. The shop I worked for had an ethanol tester and time after time samples of the % of ethanol was anywhere from 6-19%. S&S Cycles sells thick walled ethanol proof fuel line with a molded 90degree bend to go on their fuel inlet. Used that, other wise we used Tygon, with Russel fuel filters on all carb'd bikes. My vintage Brit bikes all have Russell F/F's and either Tygon or an S&S fuel line. That's what I do what other do that's their call.


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