View Full Version : Copper gas pipe?

08-23-2017, 07:57 AM

For my daily driver, a black 1994 W124 E320 Coupe with 295500 km, I replaced a section of the brake pipe, between front and rear wheels, with copper pipe and intend to do the same with the gas pipes.

It was an interesting experience to do the brake pipe for the first time. In the attached photo the cut off steel pipe near the left rear wheel can be seen. It was connected with the new copper pipe using the same connection as the factory installed one near the front wheel (according to EPC).

It worked properly at the first attempt with no leaks or rejection by authority inspection (and still no leak after about 7 weeks).

I wonder if there are any disadvantages to using copper for the gas pipes?


1991 500E, 1994 E320 Coupe

08-23-2017, 08:52 AM
What's the pipe to the right of your splce in the picture? I see what looks like hacksaw marks on it? Maybe it's just scraped undercoating? Choice of materials:

Corrosion resistance/galvanic corrosion
I think the choice of steel is probably lighter, and lower cost. I thought for brake lines there was some sort of specialty alloy which was used over copper. Cuppric? Brakes would have a make working pressure of 1500 psi, so the copper would need to be 1.5x times that burst pressure.

FYI, I did replace my fuel line- completely last year. I think it was ~$100 for the fuel line prebent from MB. It took a while to get as it was stored at a supplier in Germany. Maybe a week.

08-24-2017, 07:28 AM
Thank you for your reply!

To the right there is no pipe --- the photo is misleading. There are only the brake and three gas pipes.

08-24-2017, 08:23 AM
what am I seeing here?

The line which is sold that I was thinking of yesterday is Ni-copper. Soft, but strong and corrosion resistant.

08-24-2017, 03:12 PM
Ah. I will check it out what you put in the circle. Thank you and also for the additional info on the line.