S 414-007

 (3)  
Install the main tank access door, 542DB or 642DB
 (AMM 28-11-01/401).

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757 MAINTENANCE MANUAL
 PRESSURE FUELING SYSTEM - DESCRIPTION AND OPERATION
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 1.  General (Fig. 1)
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 A.  The pressure fueling system supplies a fast procedure to fill the fuel tanks in the airplane. The FQIS processor (AMM 28-41-00/001) controls the fueling operation in the automatic mode. The fueling crew can operate the system manually if it is necessary.
 B.  The fueling station, found on the leading edge of the right wing, has a fueling control panel and two fueling adapters. The fueling adapters attach on the front spar and connect to the fueling manifold. The fueling adapters permit fueling and defueling (AMM 28-26-00/201) of the fuel tanks.
 C.  The fueling manifold vent valve attaches to the fueling manifold and permits drainage of fuel trapped in the fueling manifold.
 D.  A 3 inch diameter fueling manifold extends from the fueling adapters toward the rear spar and across the airplane to the left wing. The fueling manifold moves fuel from the fueling adapters through fueling shutoff valves into each fuel tank. Two drain check valves are installed in the fueling manifold in the center fuel tank. The drain check valves permit drainage of trapped fuel in the fueling manifold into the fuel tank and prevent fuel from the fuel tank from entering the fueling manifold.
 E.  Four (pressure) fueling shutoff valves are installed between the fueling manifold and its branch lines. The branch lines direct fuel into the individual fuel tanks. The fueling shutoff valves control the flow of fuel from the main manifold into its branch lines. Defueling valves (AMM 28-26-00/001) connect the engine fuel-feed manifold with the (pressure) fueling manifold.
 F.  The fueling control panel, P28, controls the fueling system. The fueling control panel has all the switches and indicators necessary to do the fueling operation.
 NOTE: If you can not read the nomenclature on the fueling control panel,
____
 you can install placards (AMM 11-24-01/201).

 G.  An overfill protection system has a fuel level sensor, on the rear spar of each surge tank, and a control card for the fuel level sensor, in the electrical systems card file, P50, protects the fueling operation from overflow. The system will shut down the fueling operation if the fuel level sensors sense fuel in the surge tank.
　
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