How do you prime an overflow?!

unit91

New member
Hi everyone, I'm just in the middle of setting up my new tank w/overflow and it sounds like a toilet flush every 10 seconds. How do you get rid of this?! Obviously there is air stuck in the line which draws more air in but I don't know how to fix it!! PLEASE HELP ASAP!!
 
What type of overflow is this? is this a drilled tank or a undrilled tank?
If it is undrilled the u tube shouldnt have air inside it. If it is a drilled tank I would use a durso standpipe, you can make it silent with one.
 
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