The easiest thing I can suggest is loosen them, make sure the line is going straight into the fitting (sometimes this means bending the line a little) and while keeping it straight retighten the line and if you are usinf a flare nut wrench bear down on it pretty good.
If this does not work than chances are you have a flaw on the end of the tube or the fitting it attaches too. Either way you will have to take off the line and clean up the mating surface with a piece of emery cloth.
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69 393W Sportsroof deluxe
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