Liquified gaseous fuel storage tank level calibration control system

A method for calibrating a liquefied gaseous fuel storage tank level, the method comprising:

• monitoring a pressure signal from a pressure sensor and a tank level signal from a liquid level sensor, the pressure signal indicating a pressure value of gaseous fuel in a fuel supply system for an internal combustion engine and the tank level signal indicating a level value of liquefied gaseous fuel in the storage tank;
• storing the level value when the pressure value indicates the storage tank is empty;
• storing the level value when the pressure value or the level value indicates the storage tank is full;
• and
• determining a calibrated level range based on the stored values.

A gaseous fuel supply system for an internal combustion engine, comprising:

• a storage tank for storing liquefied gaseous fuel and supplying gaseous fuel to the engine;
• a liquid level sensor for measuring a level value of the liquefied gaseous fuel in the storage tank;
• a pressure sensor for measuring a pressure value of the gaseous fuel in the fuel supply system;
• and
• a controller configured to:
• monitor a pressure signal of the pressure sensor indicating the pressure value and a tank level signal of the liquid level sensor indicating the level value;
• output the tank level signal to a level indicator based on a current tank level signal and a calibrated level range, wherein the calibrated level range is based on stored level values when the pressure signal indicates the storage tank is empty or full.