Hello,
I recently bought my first 914, and within a couple of weeks, gas was pouring out the bottom of it. The previous owner had rubber fuel hose running from the gas tank to the fuel pump in the engine compartment (carbed car). This line had cracked where it exited the firewall under the enginer compartment.

So I am going to replace the tunnel line with stainless, keeping in mind this car is now carbed, does it matter if I use 9.5 or 8mm? Also, where the fuel line exits under the engine compartment, is it best to just connect up some hose to run into the compartment, or is there a better way? It seems the lines are pretty exposed there.

Thanks!
James

Look in the Member Vendors forum, Rotary'914 and Racer Chris, both sell complete SS fuel line kits.

It doesn't matter. Replace all the hose with modern ethanol resistant hose too. I used EFI hose even when I had carbs. As I am sure you know, you do not want that hose to burst... A CarBQue is no fun to watch... Especially if it is yours.

I base the decision of which size to use on the pump location. In back gets 9.5mm, up front gets 8mm.
Either will flow more than enough fuel until you get into big displacement engines.
We use our engine compartment lines to go through the engine shelf and decrease the amount of rubber hose used.

CFR SS lines
Rotary14 SS lines
DIY SS lines

The DIY lines are metal all the way through the engine shelf.

--- bill

There are quality vendors out there who will do well by you. If you are more DIY inclined JEGs and Summit sell SS high pressure hose (in english sizes). You can get silver bearing brazing rod and add whatever fitting you want by pushing the fitting on and the brazing with map gas or acetylene. Of course then it is permanently on the car.

This will open a can of worms but, with a Carb set up you only need to run one line from the Tank to the engine, you don't need the return line with a carb set up. Also you don't need 20-30 lbs of pressure with Carbs, mine works fine with around 3 lbs and you're less likely to blow a hose connection off. I had mine installed at the shop that did my engine rebuild while the engine was out and he ran stainless threw the tunnel and fire wall bushing into the engine compartment, then to ethanol proof hose to the carb. I don't think the diameter of the steel line we make much difference with your set up.

I just today replaced a customers lines with a CFR line. ( carbs ) Took all of maybe 2 hours total to drain tank, remove tank, pull old lines, and install new line ( single for carbs ) Highly recommended

Thanks for all the replies!
I think I will go with 9.5mm stainless through the tunnel, then connect up to the pump in the engine compartment with new fuel hose. And hopefully no more dumping gas on the side of the road!

Ok,don't want to start a new post.
We're about to replace the fuel lines through the tunnel and I got confused with the inside/outside diameters for the lines.
It's for a 3.0l conversion with CIS.
Do I have to get 8.0mm or 9.5mm tubes and does that measurement refer to inside or outside diameter since the thickness of the tube can be different.
Thanks :-)

Those are OD measurements.
It would be better to use 9.5mm for the supply side.

Thank you!