I think the majority of the fuel line failures could possibly be linked to
failed fuel regulators.  If this item fails, your line pressure can go way
up and blow off any marginal lines.  My '86 regulator failed (plugged?) and
blew off the hose that clamps on to the plastic line that runs from the
pump back to the firewall.  It was spraying gasoline all over the starter
as I was trying to restart the engine!  If the regulator is working
correctly, you should only have around 30 psi on these lines--not really
that high.  Certainly replace the old fuel lines, but don't forget the
pressure regulator.

                                                                  Jay '85
Westy