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12V is not going to help you with an impeller driven pump. There are problems with the elbow method also. You cannot strain the water coming in much at all without reducing the water flow enough to make it not work. So if you use that method, make sure your pump is accessible for cleaning in an emergency. Primer bulb cuts down on the flow except, in the case that James (luckypig) pointed out, where you temp attach it inside the tank until water flows.
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