loud sucking sound

[jslaney]

I just plumbed by first tank and unfortunatly my overflow is sucking a lot of air making a really loud toilet flushing sound.

One option I have considered is to modify it using a dursal (sp.) type overflow.

I would prefer a simpler solution as to do this would require me getting a new bulk head. (the current one is glued in).

When I plug up the hole it backs the water up and stops sucking air. I am not sure this is such a great idea as it would be more prone to blockage.

Any suggestions?