A method for controlling product distribution in an agricultural product distribution system, including monitoring, using a processor, a first static pressure in a storage tank that stores a granular product, monitoring, using the processor, a second static pressure in a meter housing, downstream of a meter roller; and controlling, using the processor, a position of a valve on a secondary line to adjust the first static pressure to a value above the second static pressure by a threshold amount, wherein the secondary line is fluidly coupled between the storage tank and a primary line that pneumatically delivers the granular product to an agricultural implement.