Fml!!!

I agree with JFL14609. Drill a 1/4" hole in the return just below the full water line. It will break the siphon and presto, no more flood. You just have to make sure the hole doesn't get clogged up with algae or anything. Honest, this works just fine. I did it to mine and I turn off the return all the time when I change water and it solved the problem.
 
Can you run your sump lower? Pull some water out, shut down the return pump & skimmer, fill the sump to the highest level you are comfortable with, turn the pump & skimmer back on then mark the sump where the water level ends up at, and don't ever fill the sump higher than that.
 
yep I made it over..I gave him a couple ideas,his return is drilled into the back of the tank..with a couple lock-line segments and then his return..

I said to buy some more lock-line segments,angle them so they go back close to the surface and then bend down..

this way you can either drill a hole in one segment close to the surface,or get a Y lock-link with a couple flat ends and angle one close to the top of the water(this is the method i use) once the water drops some the one on a angle will break the siphon
 
Not really. lol I ordered a check valve and some new line locks. But still am contemplating selling it all putting the money into a new bathroom in my house ;)
 
I'd go with the check valve. I usually put both the check valve and the hole in the return, just to be safe. But when your returns are lower than the water level in the tank, a check valve is a must.
 
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