Water Pressure issues after new pump installation
Hi, I deal with many systems on a ship that pump liquid. These symptoms are due to air getting in the system by either the pump not being immersed deep enough in the water or a break in the pipework before it enters the house. Try bleeding it off again at the first tap (faucet), if this fails I find some pumps work better if they are 'flooded' first because afetr all they are designed to pump water, not air. To do this attach a neighbors hosepipe at a convenient break in the pipe work and fill the pipe all the way down to the pump, reconnect the pipe, start up the pump but only have the firat faucet open, no others. Once this proves clear of air and a steady flow of water is observed, choose the next faucet to 'bleed'. Choose the next highest one and work your way up until all air is ejected.
Hope this helps!