Pump output must be above the highest level the water can be in the resevoir. So water may have to fall 2 feet into sump.
What I usually do on these installs is plumb in a much larger line, like 1 inch pvc from the bottom of the stand to just above my water level in the sump. And then just run my pump line into the top of the PVC (close to the stand) and let it run through there down into the sump so you don't have water free falling 2 feet. Due to the line being bigger, that helps with your syphon stop.
Nate
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