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Username Post: CU-Ni fuel lines        (Topic#359967)
Posts: 7

Reg: 02-05-17
02-27-20 03:28 PM - Post#2787471    

Has anyone used copper-nickel 5/16 to replace hard line from fuel tank to fuel pump. If so would you do it again?


Posts: 23
Reg: 10-10-18
03-04-20 07:46 PM - Post#2787959    
    In response to boybowser

I have used them they work fine but check with your supplier. Some of them do not meet SAE specs.

"6th Year" Silver Supporting Member
Posts: 1405
Loc: No. Virginia
Reg: 01-18-13
03-07-20 08:43 AM - Post#2788115    
    In response to boybowser

  • boybowser Said:
Has anyone used copper-nickel 5/16 to replace hard line from fuel tank to fuel pump. If so would you do it again?

I've never did it; but would not consider doing it.

Cu-ni is used in sea water systems on ships because of its resistance to corrosion and bio fouling. Fuel systems are always steel because of its 'strength', and because the 'fuel' minimizes any corrosion impacts.

Using it in a car's fuel line is a very poor application, in my opinion.


Posts: 56

Reg: 10-04-18
03-08-20 02:12 PM - Post#2788228    
    In response to japete92

I have used it on all my builds in last 10 years. I have been told it is used on many of the high dollar European imports. Fuel lines, brake lines. Everything. Meets all the specs I know of. More money per foot but when your trying to get that bend just right, you’ll know why you paid more. I buy in bulk from a company that’s certified to build DOT lines.

"13th Year" Gold Supporting Member
Posts: 1253
Loc: Pasadena, Texas
Reg: 04-29-04
03-13-20 07:37 AM - Post#2788553    
    In response to Beltfed

Since this question is asked in the “Stock” forum is it really ok to use this material? Who has the book?
Is a steel reproduction line the only replacement?
Cu-NI lines are used in Marine Service due to an effect similar to what happens when a snail runs into copper penny.
Sea life does not like the effect that copper has, therefore sea life does not attach to the material.
Past questions about a similar issue and usage have come up on here periodically.
One person will mention this material or mistakenly confuse the subject with this material yet another poster was talking about a different material.
Then someone says oh yeah, I use it all the time, one look at a pressure strength chart of such material shows it is basically half of steel lines. That should be one factor to convince anyone not to use it in automotive service, much less say using it in brake line service is ok.
Gasoline contains what is called "chlorides", that material will find the copper regardless of what percent and causes the copper to corrode and deteriorate. That’s why you see the corrosion on those street rods with the 3-2 bbl’s using copper tubing because at one time it was leaking. This is not good at the fittings.
Just because something is used on an off shore rig or some industrial site does not necessarily make it ok to use in automotive service.
At this rate I guess the “tygon” tubing question is coming sometime in the future.
I would replace it with a steel line, then hope I will be the one that has to replace it again in another
50 years.

VC56S 2 door Sedan, 40 Years

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