Bait pumps can have substantially different draws too. Each unit should have information on the draw in amps or ma (1/1000th of an amp). You have 10amps or 10,000 ma to draw from (roughly). I agree though that with that battery you are better off running a separate 6v battery for the pump. 12 volts to the pump will create it's own set of problems for kayak tanks.
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