I have caught them leaking at the supply line crimp fitting. It really is a poor style of crimp. I have used odiker clamps and wide clamps to repair leaking fittings before, after cutting off the poor crimp, but have not really found a favorite repair yet.
I use real heat shield material now as well.
legend in my own mind
Advice is only as good as the person applying it--
Don't make me give you bad advice!
Lemons or lemonaide, whatever your taste provides.