Art, a good practice is to not re-use a fuel line "end" as pulling them off of a barb often tears the inside a bit. And these bits often get stuck in the carb especially the needle & seat.
It is a good practice and not really expensive to just put on new lines to keep everything neat and clean. I would usually install my fuel lines a few inches to long then cut them off. After cutting I would have a "fresh" end to deal with.
I'd install a pressure gage while at it. Can really aid in diagnostics.
Dave Neptune
