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On a water system, pressure(psi) is one thing, volume(gpm) is another thing. From my own "BOO BOO" I discovered that my pressure was about the same but the volume was higher. My home well does 10gpm at 50 psi. My AS FW pump does 2.2 gpm at 65 psi. I forgot I had the city water on on day and was working with the FW system and turned the pump on and opened the galley sink. Low and behold I had a lot more water flowing. Then I remembered my city might be on, checked and it was. Shut the city off and the volume dropped, pressure gauge would still show 65 psi on pump alone. So with what you were wanting to know, yes your pump would increase the pressure for the shower but the city will give you the volume. Most household well pumps produce 10 gpm no matter if you have 30 psi or 50 psi. Most Camper pumps usually are around 3 gpm at 50-60 psi. You can have all the pressure you want but if you do not have the volume you still won't have that much water coming out. Another example, using my trailer, when on the pump our shower water comes out about 4-5" and the just falls. Kind like when you turn the garden hose on (just an open hose, no spray nozzle). Now turn the city on and the almost hits the opposite wall, city water alone goes about half way across the tub/shower by itself do to the higher volume.
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