Abstract: A system for monitoring and controlling the level of a fluid in a vessel, particularly applicable to controlling the pump operation at an oil well. The system includes a fluid level sensing unit having a plurality of sensors positioned at selected levels in the well casing outside the tubing string. The sensors operate independently to detect the presence of fluid and emit electrical signals which are received by a data conversion and sending unit immediately above the fluid level sensing unit in the well casing. The data conversion and sending unit converts the signals into discreet digital data bits which can be transmitted sequentially in one conductive wire to a data management and pump control unit at a convenient location nearby, usually at the well site. Thus, there is no need for a wire extending from each sensor. The data bits received by the data management and pump control unit are converted to a visual display in a light emitting diode panel.