New to this, Questions! 2007 Keystone Cougar 276rls

Must've had air in the line or there is a sensor or something that tells it when city water is hooked up. Pump was running very quiet but continuous, shut off city water and opened faucet and it primed up and took off! Not sure if having them both active is going to work, maybe it will now that it's primed but it wouldn't prime apparently when the city water was turned on also for some reason.