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Is the pump making noise, or is it silent? If it makes noise but nothing comes out, either the diaphragm in the pump is ruptured or the check valve between it and the rest of the system is bad, or it is sucking air from a loose or broken fitting. Diaphragm pumps don't need to be primed.
If it is silent, it isn't starting. Did you open the tap before you turned on the pump to release the pressure built up in the water lines by the city water? Usually the city water is higher pressure than the pump water, so if the pressure downstream of the pump is high it won't start. Sometimes a sharp blow to the pump body will get it started if it is being reticent.
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