The 727 fuel system is NOT able to transfer fuel, only cross feed.

In general, regardless of fuel load, start, taxi & takeoff tank-to-engine.

After climb power set: if fuel in tank #2 exceeds tanks #1 & #3, start a cross feed from tank #2 to feed all engines until all tanks are equal.

The way this is done is:

1. All boost pumps ON.............................. ON
2. Ignition ON.......................................... ON
3. All cross feed valves OPEN..................... OPEN
4. Turn off boost pumps one at a time in tanks #1 & #3
    while observing engine........ CHECK
5. When all tanks equal:
    Turn ON all boost pumps...................... ON
6. Cross feed valves #1 & #3 CLOSE......... CLOSE
7. Cross feed #2 valve OPEN.................... OPEN
8. Ignition OFF............................. .......... OFF

In the real world, this is a crew coordinated procedure. That means the F/E will alert the rest of the crew before turning off boost pumps.

If both stages of the engine driven fuel pump are working, the engine will suction feed from the fuel tank without boost pump pressure at less than full power. The boost pumps in tank #2 are slightly higher pressure than tanks #1 & #3.

Any questions????
Hope this makes sense.

Lou