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B-17. Pilot training manual for the Flying Fortress B-17. Contents

Fuel System

The fuel system of the B-17F consists of 4 independent fuel supplies of approximately equal capacities, each feeding one engine. There are 3 tanks in each wing, with provisions for 2 additional groups of outer wing feeder tanks. These outer wing feeder tanks (Tokyo tanks) are composed of 9 individual, collapsible self-sealing cells per wing. The fuel supply can also be increased by auxiliary installations of re-leasable fuel tanks in the bomb bay.

The fuel in any tank is available to any engine supply tank in the airplane through a fuel transfer system consisting of 2 selector valves and an electrical transfer pump.

There is also a hand transfer pump in the bomb bay as an emergency transfer medium. Fuel booster pumps in the outlets of the 4 major wing tanks eliminate vapor lock between the tank and the engine fuel pump. They also provide fuel to the carburetor when the engine pump fai


In the wing spar these 3 bigger lines are hydraulic ?
 

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*WWII photo- B 17 Flying Fortress Bomber plane Nose Art - THE SHAMROCK SPECIAL* | eBay

42-29591 | American Air Museum in Britain B-17F-60-BO 42-29591 Delivered Cheyenne 12/1/43; Rapid City 21/2/43; Kearney 12/3/43; Salina 31/3/43; Memphis 8/4/43; Dow Fd 16/4/43; Assigned 336BS/95BG [ET-K] Alconbury 22/4/43; 2m, transferred 401BS/91BG [LL-Z] Bassingbourn 16/6/43; AFSC 15/4/44; Returned to the USA 4135 BU Hill Fd 22/6/44; 617 BU Tooele 1/3/45; Reconstruction Finance Corporation (sold for scrap metal in USA) Kingman 13/11/45. THE SHAMROCK SPECIAL.


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*WWII photo- B 17 Flying Fortress Bomber plane Nose Art - ACK ACK ANNIE* | eBay

42-32095 | American Air Museum in Britain Delivered Cheyenne 28/1/44; Kearney 11/2/44; Presque Is 25/2/44; Assigned 457BG Glatton 14/3/44; transferred 322BS/91BG [LG-L] Bassingbourn 16/3/44, first NMF ass. to 91BG; {143m inc group's last 25/4/45} Returned to the USA 121 BU Bradley 11/6/45; 4168 Base Unit, South Plains, Texas 16/6/45; Reconstruction Finance Corporation (sold for scrap metal in USA) Kingman 13/12/45. ACK-ACK ANNIE.

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In the wing spar these 3 bigger lines are hydraulic?

Without knowing much about the hydraulic system of the B-17, it looks like it from that picture you supplied. The rigid lines go to a switching and distribution valve or some such thing, usually actuated by hydraulic pressure when a function like opening bomb bay doors or raising and lowering undercarriage is required.
 

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