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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?