Compression fittings aren’t horrible if they were installed correctly with brass or plastic inserts to support the flexible hose. The vacuum on that fuel line is relatively low, less than 8 lbs, so they would have to be snug. The fittings on the tank valve are likely the same. If it takes you more than 15 minutes to find and fix the air leak its not expensive to just replace all the fuel lines and fittings! Len
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