I just edited my last post. The charger should supply 2 amps more than the pump draws. The pump will probably draw from 1.5 to 3 amps depending what you get. If it is to be running full time, it may be best to get a regulated 12 volt power supply(actually outputs 13-13.5 VDC. A 4 or 5 amp supply would be about right. I think Radio Shack should have one.
