Pump System and Method for Operating a Pump System

The invention is based on pump system (), in particular a self-suction pump system, with a liquid conveying unit () for conveying a liquid () and with a vacuum pump unit () which is, at least in an initial operation state, configured to supply the liquid conveying unit () with the liquid (). In order to improve a construction, it is proposed that at least in the initial operation state, the vacuum pump unit () is configured to transport a gas along the liquid conveying unit ().