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only 1 liquid is allowed to be pulled out of the smeltery at a time, the one on the bottom of the tank in the GUI
 
We need logs or screenshots or something of the sort in order to diagnose the problem.
Screenshots of your setup would be helpful.

As would proofreading your posts.

But as a initial check, do both drains have the small hole pointing out [and the big one pointing in]?
 
We would need more info on the problem in order to be usefull. A screenshot would be specially usefull