If it is the main fuel supply line 82, it should have threaded end connections like this:



Perhaps someone cut fittings off and used hose clamps? Maybe reason for leaks?

If it is 40, then site says it is only 5.5mm (looks bigger than that)

Line 81 is fuel return to tank and leads to elbow 92 and it is 7.5mm ID/13mm OD.

Still waiting for some who knows car to help

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5