URQ Fuel Line Internal Diameter?

Chrismcnaz · 09-08-13, 09:13 AM

Hi all,

I have decided to replace the fuel lines on my URQ. I'm planning on using plastic braided lines but am concerned that the internal diameter of this will be less than the copper ones which are on her at the moment. Does anyone know what the internal diameter should be? I know the originals were quoted as 8mm or 5/16 but copper is obviously a lot thinner than plastic ones.

Any advice would be very much apreciated.

lefthooker · 09-08-13, 09:47 AM

8mm or 5/16 refers to the pipe bore so as long as the plastic pipes have the same internal diameter, they should be fine.

Chrismcnaz · 09-08-13, 10:02 AM

Quote:

Originally Posted by lefthooker

8mm or 5/16 refers to the pipe bore so as long as the plastic pipes have the same internal diameter, they should be fine.

Thank you LH, thats what I thought but needed to make sure.

msh · 09-08-13, 11:42 AM

What's the point of using plastic, if it's thicker, then?

Presuming that UR uses similar fittings for fuel lines than B3, I think it would be possible to fit 10mm lines with small mods. When replacing fuel lines of my A90q, I was thinking what to buy - 8 mm or 10 mm, but ended up with 8 mm as that's original size.

Hanuman · 09-08-13, 12:41 PM

Early ur- the fuel lines are NLA from Audi. Originals were steel, I thought? Mine will shortly be replaced by cunifer/copper. The existing pipes are in very good repair, considering 28years old. Except for the double crimp and cut by trolley jack adjacent forward jacking point.

Chrismcnaz · 09-08-13, 09:43 PM

Basically, I have a leak amidships under the drivers door and on inspection it appears that the rest of the lines are pretty corroded. I was foing to just repair the leaking section but feel it's a waste of time seeing the state of the existing ones. I thought about new hard Kunifer lines but just dont have the time to bend and install brand new materiel, hence the thought of plastic/rubber ones.

msh · 10-08-13, 09:17 AM

All that you need is two 4 meters long pieces of 8 mm copper pipes with one end mushroom shaped [or what's the correct form for that shape in english

] - or three, if fuel tank ventilation is included, small piece of rubber hose which will fit over copper line and some clamps. If you are going to increase power of your engine or it has been done already, 10mm lines would be better.

http://www.classic-audi.co.uk/forum/...t=19628&page=3 here can be seen how I did it on my A90q.

Chrismcnaz · 13-08-13, 06:31 PM

OK, now I know the internal diameter, does anyone know what length the fuel lines are? I'm going to order rubber lines but need to know how long the lengths need to be.

msh · 13-08-13, 06:52 PM

Rubber? You must be joking. How are you going to prevent them from hanging below the car and what you will do if they will break apart after a couple of years?

Quote:

Originally Posted by msh

All that you need is two 4 meters long pieces of 8 mm copper pipes with one end mushroom shaped [or what's the correct form for that shape in english

] - or three, if fuel tank ventilation is included, small piece of rubber hose which will fit over copper line and some clamps. If you are going to increase power of your engine or it has been done already, 10mm lines would be better.

http://www.classic-audi.co.uk/forum/...t=19628&page=3 here can be seen how I did it on my A90q.

Chrismcnaz · 13-08-13, 07:08 PM

Quote:

Originally Posted by msh

Rubber? You must be joking. How are you going to prevent them from hanging below the car and what you will do if they will break apart after a couple of years?

Thanks for that, but I assumed that the 4m lengths were what you used on your car rather than a UR.

09-08-13, 12:41 PM	#5
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,016	Early ur- the fuel lines are NLA from Audi. Originals were steel, I thought? Mine will shortly be replaced by cunifer/copper. The existing pipes are in very good repair, considering 28years old. Except for the double crimp and cut by trolley jack adjacent forward jacking point. __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

09-08-13, 09:47 AM	#2
lefthooker Senior Member Classic Audi Club Member Join Date: Feb 2011 Posts: 2,655	8mm or 5/16 refers to the pipe bore so as long as the plastic pipes have the same internal diameter, they should be fine.

09-08-13, 11:42 AM	#4
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	What's the point of using plastic, if it's thicker, then? Presuming that UR uses similar fittings for fuel lines than B3, I think it would be possible to fit 10mm lines with small mods. When replacing fuel lines of my A90q, I was thinking what to buy - 8 mm or 10 mm, but ended up with 8 mm as that's original size.

09-08-13, 09:43 PM	#6
Chrismcnaz Grown up member Classic Audi Club Member Join Date: Dec 2012 Location: Cranwell, Lincolnshire Posts: 97	Basically, I have a leak amidships under the drivers door and on inspection it appears that the rest of the lines are pretty corroded. I was foing to just repair the leaking section but feel it's a waste of time seeing the state of the existing ones. I thought about new hard Kunifer lines but just dont have the time to bend and install brand new materiel, hence the thought of plastic/rubber ones.

10-08-13, 09:17 AM	#7
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	All that you need is two 4 meters long pieces of 8 mm copper pipes with one end mushroom shaped [or what's the correct form for that shape in english ] - or three, if fuel tank ventilation is included, small piece of rubber hose which will fit over copper line and some clamps. If you are going to increase power of your engine or it has been done already, 10mm lines would be better. http://www.classic-audi.co.uk/forum/...t=19628&page=3 here can be seen how I did it on my A90q.

13-08-13, 06:31 PM	#8
Chrismcnaz Grown up member Classic Audi Club Member Join Date: Dec 2012 Location: Cranwell, Lincolnshire Posts: 97	OK, now I know the internal diameter, does anyone know what length the fuel lines are? I'm going to order rubber lines but need to know how long the lengths need to be.