Fuel Pipe ID

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Mart UK

Mart UK

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Hi,
I am looking to replace my fuel pipe. I have a single Amal mkII concentric (2934). Both pipes meet at the banjo under the float bowl. My pipes are crimped and sealed ends (tap and float bowl ends), so the only way to see the X-section is to cut the pipe in half. Prefer not to do that. Burlen need to know the internal diameter of the fuel pipe.

I think it could either be 1/4" or 5/16" internal dia. I know the taps are 1/4BSP, but apparently, that doesn't help identify the ID of the pipe. Does anyone know which size I need to order, please?

Thanks,

Martin
 
Its a cut the pipe job as the twin banjo's are available in both 1/4" and 5/16" so unless you have x ray eyes.
 
The crimped ends are fixed on the banjo, so I have to replace that anyway. If I go for a 5/16" pipe and banjo, with a 1/4" bsp fitting to screw onto the fuel tap end, should that work? I'm changing it because I need a longer pipe for the Interstate tank I've swapped on. But like to keep the shorter set up in tact for the Roadster tank.

To avoid this hassle each time, I'm thinking of not going with the crimped ends, but get the push on type for each end, secured with a jubilee clip.
 
Mart UK said:
The crimped ends are fixed on the banjo, so I have to replace that anyway.
Click to expand...
Mart UK said:
To avoid this hassle each time, I'm thinking of not going with the crimped ends, but get the push on type for each end, secured with a jubilee clip.
Click to expand...

Then all you need to do is cut the crimped ferrules off both ends and fit two new lengths of fuel pipe with clips.
 
I'm not explaining this very well. Here's a picture of my set up. The tap ends are solid fixings into the nut which tightens onto the tap and seals, there's a captive rubber sealing washer in the fuel pipe fitting, which makes the seal. The plastic pipe is crimped in place. The banjo is 180 degree dual feed from each tap.

So each end is effectively, a single unit. I don't think I can just remove the ferrule?
 

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Mart UK said:
The tap ends are solid fixings into the nut which tightens onto the tap and seals, there's a captive rubber sealing washer in the fuel pipe fitting, which makes the seal. The plastic pipe is crimped in place.
Click to expand...

Then there still seems no reason why you can't cut the ferrules off the tap spigots and the 180 banjo and reuse them?
amalcarb.co.uk

Banjo - Double 180 Degrees Metal - To suit 1/4 fuel pipe | Banjo | AMAL Carburetters

Banjo - Double 180 Degrees Metal - To suit 1/4
amalcarb.co.uk amalcarb.co.uk
 
Mart UK said:
I don't think I can just remove the ferrule?
Click to expand...
Yes you can, do it carefully and they can be reused, I don't like them and use clamps.

Those current pipes look too short, hence the bend near the tap which should be near vertical for the first inch or so.
 
L.A.B. said:
Then there still seems no reason why you can't cut the ferrules off the tap spigots and the 180 banjo and reuse them?
amalcarb.co.uk

Banjo - Double 180 Degrees Metal - To suit 1/4 fuel pipe | Banjo | AMAL Carburetters

Banjo - Double 180 Degrees Metal - To suit 1/4
amalcarb.co.uk amalcarb.co.uk
Click to expand...
Right, are you saying the crimped ferrule, tap and banjo end, are actually fitted over those same spigots? Didn know that :rolleyes:. In which case, I only need to buy fuel line and I can simply jubilee clip each end onto the spigot?
 
kommando said:
Yes you can, do it carefully and they can be reused, I don't like them and use clamps.

Those current pipes look too short, hence the bend near the tap which should be near vertical for the first inch or so.
Click to expand...
Yes, hence the change, the Interstate taps are further forward. I need another 1.5", I think (my wife never complains though...).
 
Mart UK said:
Right, are you saying the crimped ferrule, tap and banjo end, are actually fitted over those same spigots? Didn know that :rolleyes:. In which case, I only need to buy fuel line and I can simply jubilee clip each end onto the spigot?
Click to expand...

Yes, as there's no special banjo or tap spigot for crimped ferrules (or at least, none that I'm aware of).
 
Never found any plastic pipe suitable for petrol. Uses rubber ones with clamps. Don't have a proper crimp tool for ferrules. Would only use ferrules if concerned about originality. Though prefer riding the bikes rather than keeping every detail original.
 
L.A.B. said:
Yes, as there's no special banjo or tap spigot for crimped ferrules (or at least, none that I'm aware of).
Click to expand...
Brilliant, will give it a go.

Does anyone know what is the most likely ID size, 1/4" or 5/16"? If not, I'll open the crimp, but then I'm probably off the road until until new pipe and clips arrive.
 
Mike40M said:
Never found any plastic pipe suitable for petrol. Uses rubber ones with clamps. Don't have a proper crimp tool for ferrules. Would only use ferrules if concerned about originality. Though prefer riding the bikes rather than keeping every detail original.
Click to expand...
http://amalcarb.co.uk/fuelling-accessories/fuel-hose/1-4-x-1-inch-braided-ethanol-safe.html
Not cheap though, but I like the ethanol claim. My plastic ones are yellowing noticeably and are less flexible than 6 months ago.
 
Mart UK said:
If not, I'll open the crimp, but then I'm probably off the road until until new pipe and clips arrive.
Click to expand...
Are there no auto parts stores in England? Hose clamps and Neoprene fuel lines are standard hardware items.
 
maylar said:
Are there no auto parts stores in England? Hose clamps and Neoprene fuel lines are standard hardware items.
Click to expand...
It's easy for metric. I just rode over to a local Ducati dealer, because they also sell and service classic Ducatis and some classic 2T Japanese bikes and a more recent Triumph in the showroom. Only metric fuel pipe. Took ages, they kept wanting to admire and talk about the Commando. :)

Our biggest chain are Halfords. The teenagers working there just want to sell you bluetooth gadgets.
 
L.A.B. said:
Should be 1/4" as I think the 180 banjo is only available as 1/4" size.


"Description: 1/4 X 1 Inch Braided Ethanol Safe

Availability: In stock
Ex. VAT: £1.35
(Incl. VAT: £1.62 )

Price shown is Price Per Inch."

£1.62 per INCH!
Click to expand...
Plus postage!! Thanks for your help again.
Martin
 
At least it's in inches! Had a wry smile viewing those 'New' Norton factory vids waffling on about Brit heritage as it showed the V4 speedo in KPH :)
 
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