Simple MOSFET switch question
According to the datasheet for the Fairchild version of this part, the maximum gate threshold voltage is 3 V. Think of this threshold as the 'threshold' of conduction.

If you scroll ahead a few pages, you'll see some curves that correlate gate voltage with drain-source current. At 3 V gate voltage, the curve predicts well below 250 mA for any drain-source voltage.



You'll need to either reduce your load requirement, drive the gate with 4 V (or more), or choose a different MOSFET.