Low Water Press With New Pump

After putting in the new pump, I now notice all the 1/4 inch feed lines have barely any water coming out. The old pump only had a output of 210 GPH, where as the new pump has an output 300 GPH. The only other different between the pumps was that the new one could pump to a height of 8 feet and the old one only 3 feet. In my setup, I only need to pump to a height of 2 feet. Any way, I going to put another pump in this coming weekend. Did some checking with other folks. They all recommended getting a the little giant pump.