In some places under car I found squashed ( flattened) fuel line.
So I decided to change old steel fuel hardline to stainless steel pipe.
Does anyone know, where in Europe I can buy a 3/8 seamless stainless steel pipe, 4 meters coil ? (The pipe must be made in USA or Europe, but not in China.)
And can Swagelok compression fittings be used in fuel hardline connections ?

 

This is the stuff you need, and they sell the fittings too, also very decent people, helpful and efficient:
https://www.wrightsautosupplies.co.u...e-pipe-tubing/

 

Why not use rubber?

 

I'm puzzled you're wanting to use stainless steel pipe, which will be extremely hard to bend and also form connections, when you could be using Kunifer pipe. This is a cupro-nickel pipe, and easy to bend and form into connections. You can use compression fittings too. When I rebuilt a Mark 2 in the 80s I used kunifer pipe for fuel and brake lines. The name represents the constituents of the metal, (Copper, nickel, iron).

Here is a UK supplier, there will no doubt be US suppliers too.
https://www.gsparkplug.com/transmiss...mbing-gas.html

 

10mm tube may be easier to find, its only 0.5mm bigger than 3/8".

 

The existing line is 3/8" and a compression fitting will not work with the difference in size. The fit on the furrels is very tight to make a leak free joint.

You could go to a nylon line, many of the OEM's use that as fuel line. You'd need to make ribs on the ends to have the nylon fit and stay on the existing pipe though.