Engine oil pump assembly and method for operating an engine oil pump assembly

Engine oil pump assembly (10), with: a housing (12) defining an inner cavity (14) and a common inlet (22) and first and second outputs (24, 26); a shaft (28) extending longitudinally through the housing (12) and has an external drive (30); a first pumping mechanism (16) which is defined by the shaft (28) driven and connected to the common inlet (22) and the first output (24) of the housing (12) is in communication; a second pumping mechanism (18) which is driven by the shaft (28) and to the common inlet (22) and the second output (26) of the housing (12) is in communication; a first pressure relief valve (31) which is connected to receive oil from the first pump mechanism (16) and a pressure at the first output (24) to limit by an excessive oil flow to a common reservoir (32) located in the housing (12), is promoted; a second pressure relief valve (34) ...