I had only one leak when did taxi testing. It was where the fitting for the Walbro pump needs a M1.0 by .1 (bolt thread) with a washer rather than NPT tapered stuff. That is a hard to find fitting, the one I found in photo 2 was technically correct, but the recess allowed the copper washer to slide to one side when tightening, and that was creating the seep of fuel. I finally found a much better one online in photo 3, it has no recess and allows the washer to be centered - and sealed from fuel leaks.
