Fuel Line Sizing

[beh911]

See this thread:
http://www.early911sregistry.org/for...ber-fuel-lines

[Frank Beck]

Bryce,
I read it.

Call me slow witted but still not understanding the comment
10mm or 5/16”.

[brad boardman]

Bryce and Frank- Thanks for weighing in and for leading me to the other thread. I am ordering up the smooth Cohline lines in the appropriate size (7.3) and the porsche line in 9mm. I will also order some clamps. Appreciate all the help.

[Jerry L]

Sorry Frank, meant 8mm or 5/16" hose, basically the same fit in rubber hose depending what is available.

Regards

Bryce,
I read it.

Call me slow witted but still not understanding the comment
10mm or 5/16”.

[Frank Beck]

Sorry Frank, meant 8mm or 5/16" hose, basically the same fit in rubber hose depending what is available.

Regards

No worries. Anymore I assume I'm the one who is confused.

[304065]

There are a great many threads on Pelican. Here is one, with input from our departed friends Grady Clay and Warren Hall: http://forums.pelicanparts.com/porsc...72t-mfi-2.html

Use Cohline hose, the original manufacturer, in original metric sizes, not inch hose from anyone else.

[chris_seven]

We have had very poor results with Cohline 2122 and Ethanol containing fuels and tried to resolve the problems we had over a period of 2-3 years.





It started to weep and leak after around 8 months with the car developing a very strong smell of fuel whilst garaged. Cohline advised that the engine bay temperatures in a 911 were probably greater then the 50degC rating of this hose and considered our concerns to be invalid. This hose pictured below was 8 months old and the car had been driven for about 50 miles during this time.

We also fitted Cohline 2122 to a 1967 'S' used in France with E85 fuel and the hose lasted 3 months before it failed.

We now use a hose manufactured in Denmark - Brand Name Codan 3106 - and this has been good for the last two years

[EsGeht]

Googled Codan 3106 and looks good, but noticed "Must not be used in cars with injection systems". Hmmm...thoughts?
https://www2.codan.com/node/28212

[chris_seven]

I am sure that this is more concerned with K Jetronic or EFI Systems which run much higher pressure than an MFI.

An MFI runs between 1 and 2 bar and the Codan is rated at 13 bar max. operating pressure and 50 bar burst pressure.

Cohline 2122 is typically rated at max. operating pressure of 7 bar and burst pressure of 30 bar.

[304065]

We have had very poor results with Cohline 2122 and Ethanol containing fuels and tried to resolve the problems we had over a period of 2-3 years.


It started to weep and leak after around 8 months with the car developing a very strong smell of fuel whilst garaged. Cohline advised that the engine bay temperatures in a 911 were probably greater then the 50degC rating of this hose and considered our concerns to be invalid. This hose pictured below was 8 months old and the car had been driven for about 50 miles during this time.

We also fitted Cohline 2122 to a 1967 'S' used in France with E85 fuel and the hose lasted 3 months before it failed.

We now use a hose manufactured in Denmark - Brand Name Codan 3106 - and this has been good for the last two years

Chris, of course 2122 is only good for up to 10% ethanol. E85 would most certainly go right through it.