The present invention relates to a pumping method in a pumping 
system (SP, SPP) comprising: a primary lubricated rotary vane 
vacuum pump (3) with a gas inlet port (2) connected to a 
vacuum chamber (1) and a gas outlet port (4) leading into a conduit (5) before 
coming out into the gas outlet (8) of the pumping 
system (SP, SPP), a non-return valve (6) positioned in the conduit (5) between the gas outlet port (4) and the gas outlet (8), and an ejector (7) connected in parallel to the non-return valve (6). According to this method, the primary lubricated rotary vane 
vacuum pump (3) is set into action in order to pump the gases contained in the 
vacuum chamber (1) through the gas outlet port (4). Simultaneously the ejector (7) is fed with 
working fluid, and the ejector (7) continues to be fed with 
working fluid all the while that the primary lubricated rotary vane 
vacuum pump (3) pumps the gases contained in the 
vacuum chamber (1) and / or all the while that the primary lubricated rotary vane vacuum pump (3) maintains a defined pressure in the vacuum chamber (1). The present invention also relates to a pumping 
system (SP, SPP) able to be used to implement this method.