The distribution system controls the movement of fuel to the wing tanks, center tank, aft tank (on Global Express/XRS only), engines, and auxiliary power unit (APU). The distribution system supplies the flow of fuel for the fuel feed, the fuel transfer, and the refuel/defuel of the aircraft.

The distribution system includes the fuel feed, fuel transfer, refuel/defuel, thermal management, scavenge, and the fuel management and quantity gauging system. The fuel feed supplies fuel to the engines and to the APU. The fuel feed also supplies the crossfeed system for the tanks. The fuel transfer system moves fuel from the center tank or aft tank (only on Global Express/XRS) to the wing tanks. The transfer system also balances the lateral weight of the aircraft. The refuel/defuel system can only engage on the ground. The fuel management and quantity gauging system controls and monitors the operation and flow of the fuel system. 

The fuel feed system supplies fuel to the engines and the APU from the wing tanks. The center tank and the aft tank (only on Global Express/XRS) supplies fuel to the wing tanks. There is also a crossfeed system that will supply fuel to each engine from each wing tank. The FUEL control panel controls all pumps and valves. The fire handles control the engine-feed shutoff valves and the APU shutoff valve. The APU full-authority digital engine-controller (FADEC) also controls the APU shutoff valve.

The fuel transfer system moves the fuel from the center tank and the aft tank (Only on Global Express/XRS) to the wing tanks. The fuel management and quantity gauging computer (FMQGC) automatically controls the center tank transfer. It sends a control signal to the electrical management system (EMS). This signal shows on the control display unit (CDU).

The FUEL control panel controls the wing fuel transfer from the WING XFER switch. The WING XFER switch has four positions: AUTO, left to right (direction arrow), right to left (direction arrow), and OFF. The FMQGC controls the automatic operation when the WING XFER switch is in AUTO. The pilot controls the left to right or right to left (direction arrows) position of the WING XFER switch. The OFF position of the WING XFER switch prevents transfer of fuel.

On Global Express/XRS, the AFT XFER switch on the FUEL control panel controls the supply of fuel from the aft tank to the wing tanks. The AFT XFER switch has three positions: AUTO, ON, and OFF. The FMQGC controls the AUTO mode. The pilot manually operates and controls the ON mode of the AFT XFER switch. The OFF position prevents the movement of fuel to the wing tanks.

The REFUEL/DEFUEL control panels operate the refuel/defuel system.

In AUTO REFUEL, the FMQGC controls the refuel. The technician makes a selection of the necessary quantity with the INCR/DECR switch. The set quantity of fuel shows in the PRESEL window. The START/STOP switch starts the refuel operation. When auto refuel stops, the quantity in the TOTAL window is equal to the PRESEL window. The AUTO REFUEL OFF switch stops the automatic refuel procedure.

The REFUEL/DEFUEL control panel controls the manual refuel mode when the switch is in the REFUEL position. On Global 5000, there are three tanks, left, right and center. Three MANUAL switches, one for each tank, control the refuel operation when in the manual mode. On Global Express/XRS, there are four tanks, left, right, center, and aft. Four MANUAL switches, one for each tank, control the refuel operation when in the manual mode.

An OVERFILL indication will come into view in the display window. This signal will close the refuel valve for the manual switch. The refuel/defuel control panel will give you a display of the fuel quantity while you refuel the tank.

The REFUEL/DEFUEL control panel controls the manual defuel mode when the switch is in the DEFUEL position. On Global 5000, three MANUAL switches, one for each tank, control the defuel operation in the manual mode and on Global Express/XRS, four MANUAL switches, one for each tank, control the defuel operation in the manual mode.The refuel/defuel control panel will give you a display of the fuel quantity while you defuel each tank. 

The FMQGS operates in the automatic or manual mode. In the AUTO mode, the FMQGS automatically controls the movement and storage of fuel. Fuel transfer between tanks is to keep the aircraft in the permitted center-of-gravity limits.

The flight crew also has manual control when not in the AUTO mode. The FMQGS can also supply the fuel quantities. The FMQGS can monitor the fuel quantity, temperature, pressure, and density. The FMQGS can also monitor and control the movement and storage of fuel.

G5000:

GX and XRS:

On A/C 9111 and Subs, and Post SB 700-28-034 for Global Express, or on Global 5000/XRS:

The thermal management system adds heat to the fuel in the wing tanks. The heat is supplied by hot fuel from the engine. This system includes fuel return-to-tank (FRTT) shutoff-valves, check-valves, fuel tubes, and parts of the aft fuel transfer system (only on Global Express/XRS). On Global Express/XRS, the L and R RECIRC push button annunciators (PBAs) on the FUEL control panel control the thermal management system. The engine must be operated to open the FRTT valve because the FRTT valve is high fuel pressure operated.

On Global 5000, the FMQGC controls the thermal management system automatically. The L and R RECIRC OFF push button annunciators (PBAs) on the FUEL control panel permit the flight crew to prevent the FMQGC from opening the FRTT valves.

On A/C 9115 and Subs, and Post SB 700-28-029 for Global Express, or on Global 5000/XRS:

The scavenge system transfers fuel that cannot be collected by the center transfer pumps or the DC auxiliary pumps.

The center-tank scavenge system scavenges and transfers fuel from the center tank to the wing tanks. Pressure from the AC boost pumps supplies motive flow to the center-tank ejector pumps at a pressure of 12 to 20 psi (82.74 to 137.90 kPa). When most of the fuel is transferred from the center tank, the center transfer pumps shut off. The center-tank ejector pumps scavenge the remaining fuel and transfer it into collector boxes that surround the DC auxiliary pumps. As long as at least one AC boost pump operates, motive flow is constantly supplied to the center-tank ejector pump. When the center transfer pumps operate, the back pressure in the fuel lines prevents center tank scavenging.

The wing-tank scavenge system scavenges and transfers fuel from the wing tanks to collector boxes that surround the DC auxiliary pumps. Pressure from the DC auxiliary pumps supply motive flow to the wing-tank ejector pumps. The wing-tank ejector pumps scavenge and transfer fuel into collector boxes that surround the DC auxiliary pumps.