Fuel lines for Turb0\'d injection
Turbo Mini Forums

Quick question on fuel pipe sizes:

I'm just looking to buy copper fuel pipe for my 1312 Turbo and I'm not sure whether I need to have a larger diameter return pipe to the tank or not?
The 998 NA has 8mm feed and the standard oringinal 998 feed pipe is used as the return to the tank. (not sure what size that is). I get no problems with reducing the fuel pressure like this, but I'm not sure if it will make a difference with the turbo build?

Thanks

Graham

’77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675

being injection your in a better position, on the carbs a bit of a restriction can push the fuel pressure up, and it only need to go up a couple of psi befor it overloads the float valve,

obviously with injectors the above wont happen but you could still get a pressure variation however what I would do is swap the smaller pipe to the feed.

I'm using the original pipe as a feed and some 10mm OD copper as a return on the 998Ti.

No issues.

Sturgeo is right now fitting 8mm ID braided teflon (AN6) feed and return on the Mig.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

AN6 is what I'm using, iirc that should be enough for well over 400hp

Thanks Gents, that helps with sizing.

I'm just trying find out the IVA rules on fuel pipe before I purchase.

’77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675