What size (watt) pump did you get?
If you have a 14 watt pump the controller and wall wart are under powered.
I'm a little confused, you want to control the speed of the pump? I'm not sure why you have the controller, it states the pump will work in a range of 9-14VDC, not much of a range, all you are doing is under powering the pump and driving up the amperage of the circuit by not running at least 12 volt. Plus what is the lift of this pump, can't be much?