B-17 Pilots Manual.pdf

4. rUEL SYSTEM.The fuel system consists of four independent singleenginesystems as shown in figure 7. The fuel supplyfor one engine can be used for another engine only bytransferring fuel from one engine tank to anotherthrough the fuel transfer system. All fuel tanks arethe r-eU:"sealing type.~. FUEL BOOST PUMPS. - Electrically drivenfuel boost pumps, controlled by toggle switches on thecentral control panel, supply pressure required forengine starting, and supplement the engine-drivenfuel pumps for take-off and for high-altitude flight.The boost pumps are normally turned off after theclimb from take-off is well under way and startedagain at 15,000 to 18,000 feet to prevent vaporizationin the fuel lines to the engihe-driven pumps. Boosterpump pressure at engine No.3 fuel strainer is usedto supply the cylinder head primer.Q. FUEL SHUT-OFF VALVES. - Fuel shut-offvalves, controlled by switches on the central controlpanel, are installed in the fuel lines between eachbooster pump and fuel strainer, providing immediatestoppage of flow to an engine in case a line is severed.t~I,Figure7 - Fuel Flow D;agram~ ;;... '"0"" > -., ..,"" '"""" "".. 1:;:- "'..0~ 0 .~~~ ~ ~ """' ~..,.,~... - ..> .. -"' > ~ .."'.... >~~~ ~~~ ~ ~ I:~;:~" ~~~~~~~-,... ~",,~""..> ""~""XUJ~0'"~~0","'>~"'UJUJ"x"",,~o ...~~ .. 0""0.."'...>..~ "'-""~~... o~ ""-0" -.....~::~~~~~3~~ffi~ ~E~~~8~=~~>- -NUJ'"""UJ"'UJ~-""I.. "'~ "'m""->~""'""" ",..0"'"..""='"UJ """ m""..mXI-"""" -=0 ""> ~ffi5~3~::;"" 0>""-=x..o""=-""00""UJe~1(~zUJ-" ""..-........-~j !;1:->""""I--"'~~ ",,=-x"""""'-o>-u>< ..~ffi~~~;:!~~=;:!"">"""'~co"""'e.::.I I ! ! !1I ,. . .~ I ~II I !.,;.m"" 0~ '" ~ ao-0"""'" "'" -'" ..,0>......m N N0.. ....... 0 ~o""'o .'"~ao""'"."'NN"~ o =~ .,o 0N '"~~"!"-",""",,,,-NN ...~ 3~";"'--NN "...~ ~""u:~!!~~~... ~"'NN"NN'"~ =0- ~>< ....z: o>~ b\;9 :!~ ~ ~ t:.t:.ffi fd~..~~'"!!s~!>