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WING FUEL TANK
WATER DRAIN

LEGEND
UPPER SURFACE LOWER SURFACE
All tanks have flush self-closing water drain valves, installed at various low points, to permit draining of any accumulated water or residual fuel. They are located at the low point of each wing. Three gravity fill caps are provided for wing and center tank gravity refueling.
FGF1210_004
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2

VENT SYSTEM
An open vent (no float valves or flame arrestors) system is used to control the pressure in the fuel tanks. It consists of vent line tubing and ram air outlets (scoops) to ensure adequate venting of all fuel tanks. The vent lines connect the two air scoops to the fuel tanks and the fuel tanks to each other. The lines are drained of fuel which is returned to the feed tanks during operation. The low point of the main vent line is continuously scavenged by a jet pump.
The vent line distribution is to a high point in the fuselage, preventing fuel from reaching either of the two ram outlets and spilling overboard. If any fuel passes the high point, it is collected by the surge box and is drained back to the tank before it reaches the outlet. Each surge box vent line tubing runs vertically along the fuselage side wall and is coupled to the wing and center tanks.
The vent system is fully redundant such that any single blockage does not affect the venting capability.
VENT SYSTEM SCHEMATIC

AIR SCOOP
Relief valves are used to protect the tanks from over pressurization, in the case of failure of the vent system and/or refuel shutoff valve. They are located in the wing and center tanks.

FGF1210_005
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005

TRANSFER SYSTEM
Fuel contained in the center tank cannot be fed directly to the engine, but must be first delivered to the feed tanks by the transfer pumps. The normal sequence of fuel usage is to transfer center tank fuel into the wings as required to keep the wings full during climb and cruise.
After depletion of center tank fuel quantity, no further transfer of fuel is required, since all remaining fuel is contained in the wing tanks.
Control of fuel transfer from the center tank is normally under control of the fuel computer. There is no manual override for the center tank transfer system.
Center Transfer
Fuel transfer from the center tank to wing tank is completely automatic through the control of the FMQGC. The FMQGC monitors the fuel level and quantities in the wing tank (using fuel probes, compensators, densitometers and temperature sensors) to control fuel transfer from the center tank to the wing tanks. Fuel will be transferred from the center tank and delivered to the wing feed tanks, through the use of two center transfer pumps.
　
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