You would have to re-prime your return pump each time on start up the way you have it placed above the sump (I'm assuming from your drawing).
A simpler way to eliminate having to feed your fuge with a separate pump is simply to split your overflow drain going into the sump after the gate valve OR have the emergency drain go into the fuge. Depending on your flow rate, the emergency drain can take a fair amount of water (as adjusated by the gate valve) before it starts making any noticeable noise.
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