Forward tank (8) drains whenever drain valve (9) is OPEN.
Right and left rear tank levels are same when right and left rear tank valves (7
and 10) are OPEN.
If right or left rear tank leaks, close valve (7 or 10) so more fuel is not lost.
If forward tank (8) leaks, shut down vehicle and CLOSE the right and left rear
tank valves (7 and 10).
See figure 2-3 for fuel control valve schematic.
Figure 2-3. Fuel Control Valves.