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I had the same problem... I just replaced mine and it started working. But what i think your case might be is that either their could be an air bubble stuck somewhere, Not enough fluid, or, if im not mistaking, their is a problem with the second pump (ive seen a few with 2 pumps). I would suggest to hook up a seperate positive and negative cable to the pump and see if the pump is actually running and then later, check to see if fluid is actually flowing throw.
P.S. I would think that these pumps are similar to the way fish tank pumps work. If those have an air pocket in them, the water will not flow through.
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