Embodiments of a spray fluid operation system include a fluid flow circuit that provides several sprayer features while using a minimum number of fluid pumps. In an agricultural setting, a first pump (one function of which is filling) is integrated with a second pump (one function of which is spraying) and both located compactly underneath the solution tank. In some embodiments that include only two pumps, they are centrifugal impeller pumps. Each of the two pumps is capable of performing more than one function. Together, they provide self-primed filling, auto dilution, eductor rinsing, and so on, in a fluid-isolated manner to avoid fluid contamination.
