Electric Plastic Gear Pump 3.6V-6V for Smoke System Package Contents: 1pcs* Pump. Kindly Remark: 1. Pump should not be idled continuously for a long time; otherwise the gear and sealing parts will wear out. 2. The fuel pipe must be connected to fuel tank firstly, and then power on the pump to work. This smoke pump can be installed by youself, the following connection diagram is for your reference.