This high performance electric fuel pump has a free flow rate of 105 GPH (gallons per hour) with a maximum pressure of 14 psi (pounds per square inch). It is a gravity fed vane/rotor type high volume low pressure pump designed for street/strip applications. The operating fuel pressure is factory is set at 14 psi and is adjustable to as low as 4 through the included regulator. This pump must be used with included fuel pressure regulator. A 3/8 inch i.d. (inner diameter) hose is recomended with this fuel system. The fuel return line should be as large or larger than the fuel line between the fuel pump and the regulator. Free flows at 105 GPH and 70 GPH at 9 PSI.