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We've used a couple of work-arounds. The first - if you have enough pipe on each side of the break, use a piece of flexible fuel line slipped over the break and clamped. 3/16 ID, I think. Food grade clear plastic tubing also works, but hardens after a few years. Second, if the broken stub is too short,drill out the remains, insert a new section (copper works well) and solder it. I make the insert long enough to put on a flex joint where it doesn't interfere with other hardware - usually about midway - and cut the original line to fit. I've done this with nearly all of the original steel lines. It started with fixes for holes chafed by vibration (neither solder nor Seal-all worked effectively), and these were so easy to re-install (the flexibility allowed VERY easy line-up and no more crossed threads in fuel pump and filters, overflow lines and thermostart!) that I did it with all lines as they were reworked at overhaul. I think the term for this flex joint is "olive" - at least that's what Lindburg called it when he did this to all lines on the Spirit of St. Louis, to prevent them from cracking from vibration in flight.
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