Porsche Enthusiasts Club Forum

Well after depositing a large amount of fuel on my garage floor its time to sort my coording pipes. We got some 10mm copper pipe but have only been able to get hold of an imperial flaring kit which we cannot get to attach. I need to replace the section between the rubber pipe at the back and about level with the drivers door. Can anyone offer suggestions?

If your using copper pipe. It needs to be well insulated from the body and must not touch metal anywhere.
Copper work hardens and will crack very quickly. Unless its one of the 'kunifer' type mixtures

Gazza, I've just had my turbo in the workshop where they noticed a slow drip from a (partly rusty) fuel line. This was obviously an unexpected issue for me, even more so when the replacements are over £300 from Porsche and then a similar amount in labour to replace. The alternative suggested by my mechanic was Pirtec hoses, which I have opted for. Not sure of the merits of copper pipe.

Hi - Where did you get the Pirtec onces from?

Is 10mm the actual diameter of the Porche pipe or is there and imperial measurement?

Why?

Because if you have different metals in electrical contact with each other in a damp environment you get electrolytic corrosion.

Are you sure that £300 doesn't include labour?
I have just priced up the fuel pipes for my 968 and the supply and return pipes are less than £40 each from my local OPC.

Here are a couple of pictures of the nastyness.

Wow, that's pretty nasty!

Copper Work hardens, which means any vibrations will weaken it until it cracks/snaps
Many years ago one car manufacturer (OK it was Moskivich) thought it was a good idea to have copper brake pipes, great no more rust.

BUT garages in the UK were not used to them and often the pipes would get moved and end up touching each other or the body in no time at all the failed. The factory had them rubber mounted to the body. As long aS THEY NEVER TOUCHED ANYTHING THEY WERE GREAT

It might be that they are not copper but a copper ???? mix

The only electricity in the fuel pipes is caused by the static generated by the movement of the fuel and is a different issue to this one.
What I was refering to as electrolytic corrosion is caused by the presence of two unlike metals having an electrolyte (moisture) between them. This is the same way that batteries work, only obviusly not as powerful. It is the same principal as the blocks of zinc which used to be attached to the keels of iron ships so that the zinc would corrode in preference to the iron of the ship.
If you will excuse the pun, I'm a bit "rusty" on this subject but I think this is how it works.

This is in addition to the work hardening which Dave was refering to.

Just checked my invoice from Promax who replaced my full set two years ago and the total price for the oficial Porsche pipes was £180 plus 6 hours labour to fit (and then forget about for the next 17 years )