Porsche Fuel pre-pump for all models. It is designed to work as a pre-pump in 6 Volt systems or as a pump with higher fuel flow in 12 Volt systems. This pump is used to work in addition to your existing mechanical fuel pump. The pre-pump improves fuel flow, providing better performance and helps your engine start easier after sitting for a while. At 12V max voltage the pump is operating at about 100 L/hr at 0.15 bar; at 6V it is operating at about 50 L/hr and 0.075 bar.