Flaring stainless isn't always the easiest thing to do. Do you know if the person who flared your stainless is a certified automotive tubing flare engineer or the kid they hired last week, showed how to use the machine once, then left him unsupervised because stock was low and they have orders coming in? I don't think any of us do. So, inspect the flared ends for cracks, splits and proper flaring. Never assume because it was new, it was done correctly. Use all new all new connectors when possible. Those old connectors could have had 86 years of bouncing down the road subject to flexing, vibration, application of pressure then release and warped the cone causing a shape mismatch. You've already tightened them, then gave them a death grip. If they are still leaking, they are going to keep leaking.
