Fuel delivery issues

Yes, you can run fuel from the pump into an open container; that is one test, and ought to show the line being fairly clear. But, realize that even if that works that a faulty pump may not pump properly into the back pressure that will build up when the carb is attached.

I think any bug in the line will be quite dead LOL

Replacing the line will take a few hours. IIRC, there are clips into the frame rails that may need to be renewed if you keep it original. Or you can make some other attachments.