A fuel balancing system (10, 110) for a vehicle, the system (10, 110) comprising: a first fuel tank (12, 112); a first sensor (18, 118) configured to detect a level of liquid fuel (48, 148) in the first fuel tank (12, 112) and produce a first signal; a second fuel tank (32, 132); a second sensor (38, 138) configured to detect a level of liquid fuel (50, 150) in the second fuel tank (32, 132) and produce a second signal; and a balancing line (54, 154) connecting the first fuel tank (12, 112) and the second fuel tank (32, 132) to enable fluid communication between the first fuel tank (12, 112) and the second fuel tank (32, 132); characterized in that the system (10, 110) further comprises at least one control valve (82, 84, 182, 184) configured to (i) selectively permit fluid communication between the first fuel tank (12, 112) and at least one source of pressurized gas (72, 172) or between the first fuel tank (12, 112) and at least one vent (86, 186), and (ii) selectively permit fluid communication between the second fuel tank (32, 132) and at least one source of pressurized gas (72, 172) or between the second fuel tank (32, 132) and at least one vent (90, 190); and the system (10, 110) further comprises at least one control element (94, 194) configured to compare the first signal and the second signal to identify a difference in level of liquid fuel (48, 148, 50, 150) between the first fuel tank (12, 112) and the second fuel tank (32, 132), and configured to operate the at least one control valve (82, 84, 182, 184) to admit pressurized gas into whichever of the first fuel tank (12, 112) or the second fuel tank (32, 132) has a higher fuel level, while the other of the first fuel tank (12, 112) or the second fuel tank (32, 132) is ventilated. a first fuel tank (12, 112); a first sensor (18, 118) configured to detect a level of liquid fuel (48, 148) in the first fuel tank (12, 112) and produce a first signal; a second fuel tank (32, 132); a second sensor (38, 138) configured to detect a level of liquid fuel (50, 150) in the second fuel tank (32, 132) and produce a second signal; and a balancing line (54, 154) connecting the first fuel tank (12, 112) and the second fuel tank (32, 132) to enable fluid communication between the first fuel tank (12, 112) and the second fuel tank (32, 132); the system (10, 110) further comprises at least one control valve (82, 84, 182, 184) configured to (i) selectively permit fluid communication between the first fuel tank (12, 112) and at least one source of pressurized gas (72, 172) or between the first fuel tank (12, 112) and at least one vent (86, 186), and (ii) selectively permit fluid communication between the second fuel tank (32, 132) and at least one source of pressurized gas (72, 172) or between the second fuel tank (32, 132) and at least one vent (90, 190); and the system (10, 110) further comprises at least one control element (94, 194) configured to compare the first signal and the second signal to identify a difference in level of liquid fuel (48, 148, 50, 150) between the first fuel tank (12, 112) and the second fuel tank (32, 132), and configured to operate the at least one control valve (82, 84, 182, 184) to admit pressurized gas into whichever of the first fuel tank (12, 112) or the second fuel tank (32, 132) has a higher fuel level, while the other of the first fuel tank (12, 112) or the second fuel tank (32, 132) is ventilated.