Fuel System
Hooooo boy, that fuel system is a bit head crunching.
Fuel systems like these are probably the reason why I stick to aircraft with three tanks at most.
I can't find it that bad . . . .
Plan A: Flow control valve normal
Left engine on on frnt CS lft (116Gal) / reight engine on on frnt CS rt (116Gal)
the frnt CS Tanks are getting a refill from the Transfer Valve/Transfer Pump and the Tanks behind
Giving a fuelburn of about 110gal/h will give you about one hour flight time to get a refill going from one of the other 4 Tanks per side
A check light is telling you, when the selected tank is empty - e.g. doesn't provide fuel pressure at the transfer pump
The magnificent Sir Dr Naegele did something like that on the terrific BT-67 (M.Jahn) about 10 years ago with one auxtank in the wing - so it's basically study and learn / copy and paste . . .
Just-in-case you've got 'real engine' doing it's stuff, the Crossfeed Valve will supply the fuel from the other side . . .
So while the guys at Lockheed cramped fuel tanks into every available corner of the aircraft, your task while flying is reduced to check the 'selector indicator light' every hour or so and select a new tank if it's on - incredibly simple and easy enough for a 19/20 year old riding the stormy waves under the northern light some 700miles away from home port on the lookout for bad boys !
Suggestion for starters: hook up the engines to
FUEL TANK LEFT MAIN / FUEL TANK RIGHT MAIN with 650gal each - until the fuel system is done
Plan B: Flow control valve emergancy
The booster- and/or transfer pump is gone west / the frnt CS Tank resambles a swiss cheese (no pun intended - after all it's a military aircraft) / the electrics went with the booster pump . . . . .etc
Now you can bypass the frnt tank and sip directly from the selected tank without the 116Gal/1H buffer in between with the added fun of flying a glider once in a while until you get it restarted on the next tank - one out of ten . . .
At this point I'd like to adapt to Miltons opinion . . . . . . just reducing the fuel connection to the center tank prevents any further development
Just my two cents . . . .