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As Orv said, the pump draws from the fresh water tank, not from the city water line. You could just refill the tank when it gets low if you need to use the pump for pressure.
I've found that those inline water pressure regulators tend to clog up after awhile and can really drop your pressure. You might try disconnecting the regulator to see if your pressure increases. If it does, then get a new regulator. I've even had regulators right off the shelf drop pressure too low for our tastes so we got an adjustable regulator from Home Depot of Lowe's (forgot which). It's a house type and requires you also put a fitting in each end of the regulator that has a hose type thread to fit your hoses. Those are also available at Home Depot and Lowe's, in the plumbing section. My regulator is set to just under 60 psi. That gives us good pressure without hurting the lines. Any more than 60 causes clean water to shoot out of the toilet bowl during a flush.
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