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Each main fuel tank extends from the rib just inboard of the bypass valve of the fuel boost pump (AMM 28-22-04/401) outboard to the rib just inboard of the pressure relief valve for the surge tank (AMM 28-13-00/001). A baffle rib just outboard of each bypass valve contains 11 baffle rib check valves. The check valves prevent outboard fuel flow while they permit inboard fuel flow. The check valves make sure that the boost pump inlets remain covered with fuel when the airplane is in a roll attitude.

 (2)  
Each main fuel tank holds 2176 U.S. gallons of fuel of which 4 gallons are unuseable.

 (3)  
Sixteen access doors on the wing lower surface supply access to each main fuel tank.

 (4)  
A dry bay directly above the engine protects the fuel tank from hot engine fragments in the case of an engine burst. The dry bay contains 4 drain holes each with a flame arrestor to drain all moisture. Access panels exist for internal inspections.

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MAINTENANCE MANUAL

SUMP DRAIN VALVE
CENTER FUEL TANK
BAFFLE RIB
SURGE TANKRIGHT MAIN FUEL TANKOVERWING FILL PORT
BAFFLE RIB
SUMP DRAIN VALVE
SUMP DRAIN VALVELEFT MAIN FUEL TANK

OVERWING FILL PORT
SURGE TANK
Fuel Tanks
Figure 1

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MAINTENANCE MANUAL

 (5)  
An overwing fill port, found on the upper wing surface permits gravity feed fueling if pressure fueling equipment is not available (AMM 28-21-00/001).

 E.
Center Fuel Tank

 (1)  
The center fuel tank is found between the inboard tank end ribs of the left and right main fuel tanks.

 (2)  
Seven access doors on the lower tank surface supply access to the center fuel tank.

 (3)  
There is a fuel scavenge system in the center fuel tank. There are 6,924 U.S. gallons of usable fuel and 12 U.S. gallons of unusable fuel in the center fuel tank.

 F.
Surge Tank

 (1)  
A surge tank, found outboard of each main fuel tank, contains all fuel overflow from the main fuel tank and supplies fuel tank venting. A drain check valve in the surge tank permits the fuel overflow to drain back into the main fuel tank but prevents fuel flow from the main fuel tank to the surge tank.
　
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本文鏈接地址：757 AMM 飛機維護手冊 燃油 CHAPTER 28 - FUEL 1(17)