The following is a small portion of a Pipistrel discussion thread. The entire discussion may be viewed at https://groups.io/g/pipistrel/message/7378 and is printed here with the permission of Allen Inks, Patent Attorney.
"3. Be aware of the smallest hint of a weep of someting.....I thought it was coming from the water inlet at the bottom of the cylinder head, not the outlet at the top. It took Paul Whetstone of Texas Rotax and Light Sport Aircraft several hours to track it down to the correct source.... (the outlet at the top).... after I bum doped him about where the leak was, and then to repair it (cause of weeping connection was either that the hose was slightly too long on the elbow fitting... and the hose being pulled to one side by bearing against the inner curved surface of the elbow fitting the clamp was being slightly expanded and not sealing tightly or .... longitudinal scratch....and the leak stopped.
Hope this helps someone."