Dave, when I try to blow (by mouth) through the fuel delivery line, there is not much resistance when the screw is flush.
When i turn the screw in, the fuel line gets closed when the regulator screw is turned 1/2 to 1 mm in.
At this setting when i apply some suction at the blue fuelline (the one that is between the regulator and the carb) the valve opens and air is admitted.
Based on these facts is perhaps for me the starting point for the regulator screw 1/2 to 1 mm turned in? Or doesn't it make sense what I'm doing here?

Regards,
Hans


Hans Meij / Modelvliegen