Finally the proper fuel lines

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swooshdave said:
I keep forgetting how long it’s been since I rebuilt the bike. It’s getting time to replacing a lot of things.
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A mate has got only 14 months out of a pair of these inlet rubbers before they split
He phoned the shop and they told him "nobody else has had a problem with them"
I guess it's man made rubber that just doesn't last?
I have been told that putting footrest rubbers in a freezer bag with "waxoyl" stops them from splitting/perishing but I've not tried it myself
 
I find most modern rubber items are crap now, at one time you could wear out a Trident motor and the footrest rubbers were still perfect ! :)
 
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baz said:
A mate has got only 14 months out of a pair of these inlet rubbers before they split
He phoned the shop and they told him "nobody else has had a problem with them"
I guess it's man made rubber that just doesn't last?
I have been told that putting footrest rubbers in a freezer bag with "waxoyl" stops them from splitting/perishing but I've not tried it myself
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Considering it’s been more like 10 years I don’t think it’s bad. It depends a lot if the rubber see a lot of sun and ozone. Two things that speed the determination. As for splitting it’s common for people to use things like screwdrivers to install those rubbers.
 
I made mine using a hydraulic crimping machine and progressively turning and crimping to avoid having ridges on the ferrules.
 
MexicoMike said:
"I think the reason that they switched the fuel line to be moved to behind the Amal's was due to the possible blowout of the head gasket..."

Well, maybe but I think they did it simply because it was cheaper to produce. ;)
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There was a service bulletin about replacing the old crossover type fuel lines. It was changed for safety reasons. I have seen flames coming out from a blown head gasket (not a Norton) and it was scary.
I like being able to see the fuel, but the stainless lines do look good.
 
Have had the same set for a few years now and they have become yellow and stiff. Still function perfectly tho
 
Kjell said:
Mine is completely brittled. I will go with AN fittings and quality hose. I will be starting with this from the tank on each side and move my way downwardshttps://www.ebay.com/itm/183253934543
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That's a pipe connector.
The normal fitting is a nut and spigot.

Classic Motorcycle Fuel Pipe / Tap Spigot & Nut Chrome Plated1/4" BSP UK Made

Classic Motorcycle Fuel pipe spigot & nut (chrome finish) for 1/4" bsp gas fuel tap and 1/4" bore pipe Excellent Quality. Made in UK
www.classicbikepartscheshire.com www.classicbikepartscheshire.com
 
L.A.B. said:
That's a pipe connector.
The normal fitting is a nut and spigot.

Classic Motorcycle Fuel Pipe / Tap Spigot & Nut Chrome Plated1/4" BSP UK Made

Classic Motorcycle Fuel pipe spigot & nut (chrome finish) for 1/4" bsp gas fuel tap and 1/4" bore pipe Excellent Quality. Made in UK
www.classicbikepartscheshire.com www.classicbikepartscheshire.com
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Yes it is indeed. It is my understanding that the threads is 1/4 " BSP on both sides of the petcock. From there I will be using 1/4 Bsp to AN 6 adapter

www.ebay.com

-6AN AN6 To 1/4" BSP BSPP Straight Adapter Black | eBay

Find many great new & used options and get the best deals for -6AN AN6 To 1/4" BSP BSPP Straight Adapter Black at the best online prices at eBay! Free shipping for many products!
www.ebay.com
 
Kjell said:
It is my understanding that the threads is 1/4 " BSP on both sides of the petcock. From there I will be using 1/4 Bsp to AN 6
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Seems like a lot of unnecessary complication.
Sorry, but I don't see the point.
 
Not very complicated in my opinion .AN hoses and connections are used within the drag racing industry all over the world.
When I saw the original fuel lines on my commando I have to admit I was amazed. Not even a hose clamp on the tee connections.
I guess we all spend our money were we feel its worth-
 
Ahh. And they do look fantastic, but that is my humble opinion....
 
Kjell said:
Not very complicated in my opinion .AN hoses and connections are used within the drag racing industry all over the world.
When I saw the original fuel lines on my commando I have to admit I was amazed. Not even a hose clamp on the tee connections.
I guess we all spend our money were we feel its worth-
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It’s just gravity fed so no pressure on the joints.
 
johnm said:
I found the earlier type with plastic three way connectors to be very prone to leaking and deterioration with modern fuels. The whole line goes yellow, hard and brittle.
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On earlier models the 3 way connectors were metal ( brass and plated ) and yes the lines went yellow and hardened but not so it became brittle .The fuel was not like today's .
 
HRD said:
On earlier models the 3 way connectors were metal ( brass and plated ) and yes the lines went yellow and hardened but not so it became brittle .The fuel was not like today's .
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The lines go brittle because gasoline leaches the plasticizer out of the PVC tubing. Modern tubing designed for gas and oil like Tygon F-4040-A should be a better choice. The downside is the translucent yellow color and it is somewhat less flexible than regular PVC. There is also a clear version from another company (Excelon) that is supposed to be fuel resistant. I have made a set of lines from the latter, but it has only been holding fuel for about 6 months. There is also a thin walled, bright yellow tubing from Motion Pro that seems to be holding up well.
 
Ron L said:
The lines go brittle because gasoline leaches the plasticizer out of the PVC tubing. Modern tubing designed for gas and oil like Tygon F-4040-A should be a better choice. The downside is the translucent yellow color and it is somewhat less flexible than regular PVC. There is also a clear version from another company (Excelon) that is supposed to be fuel resistant. I have made a set of lines from the latter, but it has only been holding fuel for about 6 months. There is also a thin walled, bright yellow tubing from Motion Pro that seems to be holding up well.
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You say "yellow" like it's a bad thing...
 
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