Powerhead burning out?

[lisajulia]

I used the search tool to try and find any others who might have had this problem..but I came up with nothing

Basically, I have a 72gl set up and the powerhead that goes into my skimmer keeps burning out. I have a cap2200 and I have gone through 3 of them. They basically almost explode, and I have NO idea what is causing this..of course the guy at the LFS just looks at me and scratches his head when I come in for the new powerhead.
It's almost like they just BURN OUT..and OH the smell!
Any suggestions would be greatly appreciated.
The tank is almost 3 years old and like I said, this is at least the 3rd skimmer powerhead that's died.

 

[hackteck]

where did you purchase these from, from the same lfs

 

[Brenden]

Your sump water level is not dropping below the power head is it? Any chance of it sucking air? How muck back pressure does it have? Have you considered a different brand pump? I just looked at my post. Sorry for all the questions.

 

[lisajulia]

This is what I have...but I took out the bioballs and turned it into a refugium. The pump that hooks into the skimmer is the one that keeps burning out. The water level was plenty high...so I am really at a loss. I honestly don't know which brand to get as an alternate since the pvc/venturi is configured a certain way and seems to only work with a particular pump.
I am totally confused!
http://www.futurepets.com/cgi-bin/FULLPRES.exe?PARTNUM=ACA203002&LARGEVIEW=ON
Thank you again!