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Yeah my best bet is something is going on with the wiring (short) or the pump is frozen and causing your fuse to blow up. If the pump is frozen(stuck) or the spin is restricted it will still be getting the 12v, but because it can't spin freely it will draw an excessive amount of current causing your fuse to blow. Take the pump out, put it in a bucket of gasoline, make sure you have the hoses connected properly and apply 12v to it and see what happens. If you know how to use a dmm you can find out how much current it's drawing and compare it to the datasheet. Be extremely careful if you want to do this as a spark can ignite the bucket of gasoline. It happened to me once, good thing I had a fire extinguisher inside the car. Good luck
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