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914World.com _ 914World Garage _ Copper fuel lines

Posted by: WildBill Jul 24 2006, 10:08 AM

The PO ran copper fuel lines, I know most people use SS but do I need to replace the copper? Will it do anything bad? Thanks

Posted by: So.Cal.914 Jul 24 2006, 10:16 AM

I've seen copper used on some bikes and hot rods, haven't heard anything so far.

Posted by: bd1308 Jul 24 2006, 10:17 AM

Well, on the subject of Copper.

Copper actually work hardens, meaning over time, the flexing and/or bending of the copper lines actually causes voids in the molecular lattice of the structure of copper. Over time, these voids actually move down the lattice of the pipe and these voids actually collect and grow, eventually causing a crack.

This can be aleviated by quenching the copper after a period of time (opposite of ferrous metals) but in this usage for copper piping, it isnt really applicable nor anything that is easily done.

I would suggest HEAVILY anchoring that line firmly to the firewall to prevent flexing but I wouldnt see why, under these precautions and with firm anchoring, why it wouldnt work.

b

Posted by: gregrobbins Jul 24 2006, 10:34 AM

The local air cooled shop that does a lot of work for me has been doing copper conversions on fule lines for 20+ years and claim to never have encountered a problem.

Still, I picked up a set of stainless steel lines from Racer Chris when he was offering them for sale last spring.

Posted by: lapuwali Jul 24 2006, 10:43 AM

It's also common to see copper-plated steel used for brake lines (the British guys do a lot of this), and said brake line is sometimes used for fuel lines.

Posted by: WildBill Jul 24 2006, 11:07 AM

Thanks for the feedback guys, I think I will just anchor it good and leave it for now.

It has been 16 years and it looks like new so I think it will be OK. I will replace it next time I pull the engine, hopefully that will be for a six or subie install.