Pumptec - Model 350U-190/M130-8 - Sprayer Sub-Assembly for Regulator and Filter Included Installation Manual

Choose a location where the pump is protected from rain and road spray and is less than 6 ft from your tank.
 It is best if the pump is located below the lowest water level in your tank with a downward sloping delivery hose so that the pump inlet is always flooded. If it is necessary to mount the pump higher, the maximum suction lift is 3 ft from the bottom of the tank. A foot valve is recommended for all suction-lift applications.