As I mentioned when I first started my engine a few months ago I had an annoying coolant leak. The cause of the leak appears to be that the lower left fitting on the pump housing was adjusted to clear the engine mount. If this is done without removing the fitting and applying fresh locktite the original sealant will be compromised and the fitting will leak. I pulled off the housing and replaced the fitting and no more leak. I did however learn an important lesson about my Dynon but that is a different thread (see My lesson for the day)