Pump system, engine and vehicle

The utility model relates to the technical field of vehicles, and discloses a pump system, an engine and a vehicle. The medium collector comprises a first interface, a first clamping part and a first limiting part; the first clamping part and the first limiting part are respectively connected to the first interface; the pump body comprises a second connector, a second clamping part and a second limiting part, and the second clamping part and the second limiting part are connected to the second connector; one of the first interface and the second interface is annularly sleeved on the outer side of the other interface, and the first clamping part and the second clamping part are clamped so as to limit the relative movement between the medium collector and the pump body along the axial direction of the first interface; the first limiting part and the second limiting part are matched to limit relative movement between the medium collector and the pump body in the circumferential direction of the first connector.