Abstract: A pumping system for pumping liquid from a lower level to an operatively higher level; said pumping system comprising, pumping device fitted at the lower level; a bent delivery conduit; said conduit having an operatively inclined ascending conduit section; an operatively inclined descending conduit section and an operatively horizontal peak section between said inclined sections; one end of said ascending conduit fitted to the outlet of said pumping device and one end of said descending conduit being below liquid level of said higher level; a junction being defined between said horizontal peak section and said descending conduit section; a port opening provided at the peak section spaced apart from said junction; and control means adapted to introduce pressurized air into and evacuate air from said delivery conduit through said port.