A field sprayer (10) includes high capacity centrifugal pump (86) for tank filling. The centrifugal pump (86) is connected in parallel with the fill connection (70, 74) and primed by a lower capacity diaphragm spraying pump (20). Two check valves (76, 92) and a pressure sensor (94) allow a sprayer controller (100) to automatically control the pump priming and tank filling with the activation of one switch (104). The two-pump system preserves tank filling speed, even during operation of eductor (48) or tank agitation functions. The centrifugal pump (86) can be removed and the spraying pump (20) operated to fill the tank (16) without substantial base machine modification.
