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Old 23-01-2020, 10:50 AM   #1
Big Al
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Default New fuel lines....

So currently have 8mm feed and return lines in my bug as it's fuel injection.

With all the nasty brake hose eating ethanol they are putting in fuel these days I'm a bit worried and looking to replace it.

Firstly I was going to run 8mm teflon/ptfe lines front to back but that stuff ain't cheap. Weirdly it seems the stainless reinforced stuff is cheaper than the woven nylon coated stuff. Anyone know why?

Anyway I cane to the conclusion it would be best just to run copper front the back and buy a meter of PTFE to link it as is clampable but I'm struggling to find any 8mm INTERNAL DIAMETER copper and don't really want to reduce the size of my lines.

Anyone any ideas? I do all this on a tiny budget so no race car fuel line suggestions please!
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Old 23-01-2020, 12:56 PM   #2
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google 10mm kunifer.

not exactly 8mm ID though, 10mm OD with 0.7mm wall (on the 1st result i found)
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Old 23-01-2020, 01:50 PM   #3
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I used stainless line on mine. 35 for 3 meters
Something like this
https://rover.ebay.com/rover/0/0/0?m...2F131230186252
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Old 23-01-2020, 06:10 PM   #4
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Tx guys I was looking for stamraight copper. Apparently that can work harden with vibration and crack

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Old 23-01-2020, 08:18 PM   #5
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Have you considered nylon tube for the hard lines ? I believe a lot of factory installs in modern cars are nylon. 10mm outer = 8mm inner. And it's cheap as......

https://www.ebay.co.uk/itm/FLEXIBLE-...vH-t6SVkk14UdA

You can get different colours too for feed & return if you like ....

If you want metal then try kunifer rather than copper. It's preferred over copper for hard brake lines. https://www.ebay.co.uk/itm/10MM-OD-x...AAAOxyhS9Thbyi - but it ain't cheap.

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Old 23-01-2020, 10:57 PM   #6
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i run kunifer front to back in 8mm then use a 8mm hardline to AN6 adapter and then ptfe an6 for the engine bay ect.

the nylon goes over the stainless braid hence why its maybe more.
the actual hose isn't too bad in cost wise when you look at it, its the fittings that add up!
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Old 24-01-2020, 10:26 PM   #7
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Quote:
Originally Posted by Mr.Whippy View Post
Have you considered nylon tube for the hard lines ? I believe a lot of factory installs in modern cars are nylon. 10mm outer = 8mm inner. And it's cheap as......

https://www.ebay.co.uk/itm/FLEXIBLE-...vH-t6SVkk14UdA

You can get different colours too for feed & return if you like ....

If you want metal then try kunifer rather than copper. It's preferred over copper for hard brake lines. https://www.ebay.co.uk/itm/10MM-OD-x...AAAOxyhS9Thbyi - but it ain't cheap.

Dave.
That does look good and the price is right but it's not clampable. I basically have a standard but 8mm outlet on the tank and a 'bulbed'? feed on the engine. Barbed connectors on fuel pump. God knows how I'd connect to all them.
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Old 24-01-2020, 10:27 PM   #8
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Would need more then 7.5m I think too. Was going to get 10 in something to be sure.
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Old 26-01-2020, 11:42 PM   #9
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Quote:
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That does look good and the price is right but it's not clampable. I basically have a standard but 8mm outlet on the tank and a 'bulbed'? feed on the engine. Barbed connectors on fuel pump. God knows how I'd connect to all them.
Would normally push the nylon tube over a barbed fitting and secure with a hose clamp. 2 ear crimp style hose clamps probably best & cheapest for this. If it's too tight to push on then try dipping in boiling water first.

Brightly coloured fuel line will also make your car faster, this works in just the same way as it does for snazzy colour brake calipers.



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