before i run to the plumbers shop, the fuel lines, i have heard that they can be quite restrictive. is this tru?

Is it worth replacing? what guage would u recommend (in mm) and what material?

Copper?

Theres are going into the tunnel, whilst it is stripped, thought of considering as much as a i can, including a return line for any future powerplant/fuel management considerations.

Cheers guys...

i'm no vw expert but I think the standard line is 5mm which is too restrictive for an high hp efi engine, you could use this as a return or breather though. Most brake type shops will sell fuel line, its steal'ish or an alloy as you can bend it by hand if required. I'm running an-6 lines to my engine which is 3/8 or about 8~9mm i believe (not sure if this is ID or OD).
One thing to note it that the standard fuel line is welded in at several locations, you will need to come up with a suitable mounting solution as if its banging aroud it will work harden and become brittle.

with my tunnel currently open for the clutch tube i fitted, was perhaps considering using the stock mounting positions... however enlarged/extended to take the larger fuel line. perhaps a few internal sleeves drilled, fitted with rubber gromments would dampen the vibrations... even if it is siliconed to the metal sleeves, and therefore fastened but in a dampened mannor to soften the bumps.

just remember that You don't ever want to open the tunnel again

You could even use copper pipe

and whatever pipe you use, it needs to be permanently
attached to something in the tunnel..
so a pipe with metal clamps would be better than rubber grommets which will eventually crack due to age..

metal hose clamps or pipe clamps etc...
check out a hardware store..

I would leave the original pipe in place as its still useable

and You could clamp another pipe to the original pipe..

cheers

LEE

chris i'd highly recomend doing it now while its a nice easy job
id run a 10mm main and a 8mm return
this is the same setup as my black bug has for EFI
even if u dont use 10mm and just use the 8mm for ur main supply for a stock vw engine it allows for easier upgrades down the track

thanks guys, will look into it.

will call to the local plumbers shop for some copper 10mm and 8mm lines. Using copper though, i would have to solder it rather than weld (the shop will be able to tell me anyways).

But ur right, whilst i got it open, i figured it would be worth while.

Im in the same position as you with my car body off and a need to replace the fuel line. Someone had run a fuel line inside the car like the brake line (illegal) along the floor.

I have been contemplating using a braided or flexible fuel line down through the tunnel and using cable ties to tie it to the original fuel line. Would also like some feedback re this thought of the flex line.

I to am planning ahead and maybe wishful thinking of efi further down the track, not to mention a little boost. Now I just need to get the car back together and ask the wife for more money

i wouldnt use copper
after working as a fridgy for 4 years i certainly wouldnt use copper
the vibrations and condtions in car copper is too soft for

the stock fuel line is only held into the tunnel by bent over tabs same way as the brake line on the outside
all u would need to do is get some staino hose clamps and clamp it to the original fuel line

welding has to many risks

Dont use copper, it will work harden with the vibrations in a car and become brittle and break. Rubber will also degrade over time.

If you got contacts and/or cash, instrumentation line used in industry are safe for almost every liquid and they have a range of hold down brackets. If I had a cam handy I'd post some pics. Brackets are made for multiple pipes and sizes with unistrut, bolt, clamp, clip, anti-vibration type of mounts.

I did mine with stainless tube - clamped in a couple of spots

Thanks boys,

I have written myself a shopping list for tomorrows runabouts...
Will show some progress shots when the chassis is finished. Depending on how long it takes to source a few iffy bits, i got no idea when it will be rolling out the garage.

I have a file on Fuel line installation that contains factory instructions.

Send me your email and I can send it to you.

CP