Fluid recirculation within printing device reservoir via extraction pump and supply pump

A non-transitory computer-readable data storage medium storing program code executable by a printing device to:

• set an extraction pump of the printing device fluidically connected to a reservoir of the printing device to a specified rotational velocity, a power of the extraction pump correspondingly increasing until the extraction pump rotates at the specified rotational velocity;
• while monitoring the power of the extraction pump, continually increase a power of a supply pump of the printing device fluidically connected between the extraction pump and the reservoir, the power of the extraction pump correspondingly decreasing to maintain rotation of the extraction pump at the specified rotational velocity;
• and
• responsive to the power of the extraction pump decreasing to a characterized value for the specified rotational velocity, cease increasing the power of the supply pump.