Abstract: A combined lift and metering pump includes a set of relatively rotating pump elements in the form of an outer gear and a eccentrically disposed inner gear fixed on a drive shaft. A regulator communicates through a control passage with a discharge chamber of the pump to regulate fuel pressure in the discharge chamber and a metering orifice formed through the outer gear provides for intermittent communication with a timing port once with each revolution of the outer gear for discharging a metered amount of fuel from the discharge chamber.

Abstract: A fuel burner pumping system includes a pump having an inlet communicating with a fuel source and an outlet which communicates with a control valve assembly for regulating the pressure of the fuel supplied to the fuel burner nozzle or nozzles through a nozzle passage leading from an outlet port of a main chamber in the control valve assembly. High pressure fuel is pumped into the main chamber through a first outlet passage leading from the pump. A second outlet passage leading from the pump to the nozzle passage by-passes the control valve assembly so that air may be purged from the system when the pump initially is started. An air purging valve within the second outlet passage is movable between closed and open positions for blocking fuel flow through such passage during normal operation of the pump and for opening the second passage when the pump initially is started.