kunifer cupro-nickel fuel lines

[ade61]

just installing a 10mm o/d kunifer fuel line (flow to injected engine, so about 4 bar max) and not having much luck with flaring it (the flaring tool seems to hold the pipe well, so well that it crushes it quite a bit), but the resulting flare doesn't seem large enough. On the same line, i have some Swagelock stainless steel twin olive compression-type connectors, but i am not sure these will stay tight/leak-free (as the kunifer is comparatively soft, will the fitting loosen over time?).
So, any tips on flaring....and anyone successfully using compression fittings on kunifer?

[Krikkit]

What kind of flare tool are you using?

[ade61]

its probably a cheap one, where the pipe is clamped by squeezing the legs of the tool together (bit like a crimping tool), then swing the coned pointy bit over etc

[v8250]

ade61 said:

So, any tips on flaring....and anyone successfully using compression fittings on kunifer?

Kunifer is more rigid than standard copper and so benefits from being lubricated before the cone is inserted. I've used WD40 for this on many cars, works every time. Also, be sure to place the forming block in a vice when winding-in as this ensures the forming is centre true. You may like to practice on some spare lengths beforehand...also, sometimes a little heat helps making the pipe a little more malleable. The above works for both male and female forms.

[ade61]

thanks v8 very helpful