Tank fill control apparatus and method

A tank fill control apparatus comprising:

• a tank-installed switch, including:
• a tubular body including an upper end, a lower end, and an annular mounting flange on an outer surface between the upper end and the lower end;
• a liquid level sensor including a detector, a float in and moveable along a length of the lower end and a rod connecting the float to the detector, the liquid level sensor configured to sense a liquid level relative to the lower end and further configured to generate a signal when at least a maximum selected liquid level is sensed, wherein the lower end includes a tubular wall and the float and rod are positioned within the tubular wall and the tubular wall includes a port adjacent the annular mounting flange to permit pressure communication between an outer surface of the tubular wall and an inner surface of the tubular wall;
• and
• a control unit in communication with the tank-installed switch including:
• a liquid level monitoring function for receiving the signal from the liquid level sensor;
• and
• a control function for generating at least one of (i) an alert signal indicating that the maximum selected liquid level is sensed and (ii) a valve control to modify a fill operation from a tank fill system.