A portable, rotating vane vacuum pump, said portable vacuum pump including: a housing having an inner surface with at least a portion thereof extending about a first axis and defining in part a bore, a rotor mounted within said bore for rotation about a second axis offset from and substantially parallel to said first axis, said rotor further including at least two vanes mounted for sliding movement within respective slots in said rotor, a motor to rotate said rotor in a first rotational direction about said second axis within said bore, said vanes having inner and outer edge portions (23,25) with the outer edge portions being in contact with the inner surface of said housing as said rotor is rotated by said motor about said second axis within said bore separating said bore into a plurality of chambers (27, 27', 27"), said housing further including at least one inlet passage and at least one outlet passage through the inner surface in respective fluid communication with said bore, characterised in that the pump includes: a lubricating oil system with a removable oil reservoir cartridge, an oil inlet arrangement to supply oil from said reservoir cartridge to the bore of said housing, and an oil return arrangement to deliver oil back from said bore in said housing to said reservoir cartridge, said reservoir cartridge forming at least a portion of a sump for said oil being delivered by said return arrangement from the bore of said housing, said portable vane pump having a main body and said reservoir cartridge including said sump portion thereof being removably attached to the main body of said portable vane pump by a manually operable arrangement wherein said reservoir cartridge including the sump portion thereof can be manually removed from the main body of the portable vane pump as a unit. a housing having an inner surface with at least a portion thereof extending about a first axis and defining in part a bore, a rotor mounted within said bore for rotation about a second axis offset from and substantially parallel to said first axis, said rotor further including at least two vanes mounted for sliding movement within respective slots in said rotor, a motor to rotate said rotor in a first rotational direction about said second axis within said bore, said vanes having inner and outer edge portions (23,25) with the outer edge portions being in contact with the inner surface of said housing as said rotor is rotated by said motor about said second axis within said bore separating said bore into a plurality of chambers (27, 27', 27"), said housing further including at least one inlet passage and at least one outlet passage through the inner surface in respective fluid communication with said bore, characterised in that the pump includes: a lubricating oil system with a removable oil reservoir cartridge, an oil inlet arrangement to supply oil from said reservoir cartridge to the bore of said housing, and an oil return arrangement to deliver oil back from said bore in said housing to said reservoir cartridge, said reservoir cartridge forming at least a portion of a sump for said oil being delivered by said return arrangement from the bore of said housing, said portable vane pump having a main body and said reservoir cartridge including said sump portion thereof being removably attached to the main body of said portable vane pump by a manually operable arrangement wherein said reservoir cartridge including the sump portion thereof can be manually removed from the main body of the portable vane pump as a unit. a lubricating oil system with a removable oil reservoir cartridge, an oil inlet arrangement to supply oil from said reservoir cartridge to the bore of said housing, and an oil return arrangement to deliver oil back from said bore in said housing to said reservoir cartridge, said reservoir cartridge forming at least a portion of a sump for said oil being delivered by said return arrangement from the bore of said housing, said portable vane pump having a main body and said reservoir cartridge including said sump portion thereof being removably attached to the main body of said portable vane pump by a manually operable arrangement wherein said reservoir cartridge including the sump portion thereof can be manually removed from the main body of the portable vane pump as a unit.