Water pump advice

2014 nuevo water pump , bleeding the taps water pump takes ages after a tank refill , could that be a sign the water pump is on it's way out . It is the original pump , not sure where the pump is fitted , how do you change the pump any advice , thanks

Pump is inside fresh tank, there is a worksheet on replacing with Shurflo in the worksheet section below,  typing Shurflo into search box will also bring up lots of helpful info, including two current threads in the technical section. There is no need to remove existing pump when installing Shurflo