This question is a bit of a myth in the industry. A lot of people think that pumps merely provide flow—and resistance is related to the downstream or pressure is resistance to flow. All of the energy that is put into your system comes from the pump. This is regardless of what is happening downstream, one of the natures of physics is that energy can only go from an area of high energy to an area of low energy.
This means that if the resistance somewhere downstream had pressure, the pressure doesn’t start at the resistance and move backwards to the pump. It starts at the pump and pressure rises only enough to overcome the energy being put in by the pump. This is one of Newton’s laws of motion. Although it is a little bit counter-intuitive in some cases. All energy starts at the pump and it’s always higher at the pump. That’s the only way that flow can go from the pump down into the system.