Sounds like you ran out of fuel in tanks 1 through 4 and didn’t have the feeder tanks 5 through 8 including 5a and 7a configured correctly to transfer fuel to them throughout the flight, hence why they ran dry. The trim tanks 9 through 11 can also hold quite a bit of fuel and on longer flights you may need to transfer excess fuel out of them into the main tanks to keep the engines going while still maintaining CofG for that phase of flight. There are plenty of youtube videos out there that show how to correctly transfer fuel with this aircraft.