fuel and brake pipes

keastygtir

keastygtir

Well-Known Member
Hi

I want to replace my rusty fuel and brake pipes that run under the car. My question is are they just standard type pipes? Can I make up my own or do I need something more specific?

Thanks
 
red reading

red reading

Active Member
Kunifer or copper for the brake lines, you will need fittings and a flare tool, pretty easy and cheap to do....use ku fire as it does not work harden as you bend it to shape as quickly as copper, and fuel line material should be available from motor factors as well in aluminium or steel...again you just bend to shape.
 
grim_d

grim_d

Member
You can get kunifer in all the sizes required. Look for cupro nickel pipe on eBay from seller clarickmotorengineering. 3/16 (4.7mm) for brake lines. The fuel lines are 8mm I think and the vent line is 6mm. I would need to check what I've bought to confirm.

You need 10mm pipe fittings with No Lead in. Automec brass ones available from demon tweeks.

This is the best flarer I have found that didn't cost a fortune and makes proper flares without damaging the pipe like the cheap ones. http://pages.ebay.com/link/?nav=item.view&id=151035636166

I reckon you can get away without flaring the fuel pipe as long as you use good jubilee clips.
 
grim_d

grim_d

Member
I haven't but I was going to, don't imagine its any more pressure than the return line of a power steering system? Happy to be proven wrong though!

You would need a pretty fancy expanding swaging tool to do It properly, I had thought about putting a bit of a flare on it but it would be murder to get the rubber hoses on. I'm keen to know what someone like warpspeed does when replacing fuel lines as he must do loads.
 
M

MarkTurbo

Well-Known Member
grim_d said:
don't imagine its any more pressure than the return line of a power steering system?
Click to expand...
The pressure in the return line on the power steering is pretty low as all its got to do is push the fluid back up to the reservoir, if you look on page 6 of this link it quotes upto 50psi but in a lot of cases it won't even be that high.

http://gatesupdates.com/common/downloads/files/Gates/autoEducation/428-7172.pdf

The fuel feed line will be upto 5 bar (72.5psi) assuming you were running 3 bar base fuel pressure and say 2 bar boost. I wouldn't use either without some sort of bead on the tube to stop the pipe coming off after seeing on a test rig how easily rubber hose can blow off at only 2 bar if its not clamped properly!

You don't need anything fancy to bead the end of 8mm tube, one of these will do it. Although it might be a bit expensive if you're only buying it to do a couple pipes.

http://sykes-pickavant.com/products/braking-tools/pipe-flaring-tools/02700200
 
grim_d

grim_d

Member
There we are then, I didn't know fuel lines were under quite as much pressure! You can get different dies for the tool I posted. The problem with the sykes sets are the price. And the cheap multi size sets damage the pipe too much for me with the way they clamp.
 
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