The earlier corsairs have both center tanks and wing tanks. In the F4U-1, the center tank is loaded "first", so that the wing tanks only get fuel when the center tank is full -- which means that a 75% load out results in 100% load in center, and 25% in each of the wings.
UNfortunately, the F4U-1A had different treatment on introduction. For this plane, all tanks are filled proportionately, which makes a 75% load out show up as 75% in every tank.
This is a fairly big deal, since less mass in the wings helps roll rate considerably. Manging this manually by is a nagging annoyance, requiring frequent adjustments so the wings are burned first and so one side doesn't get out of balance during the process. The annoyance comes in with realization that other rides don't requre this degree of attention, and that the "fix" has already been programmed with the F4U-1; I'm no programmer, but could it be as simple as copying the fuel sequence from the -1 code and pasting into the -1A section?
(The embarrassment comes in with admission that I've stalled the engine many a time by forgetting to reactivate auto fuel management in a fight!)
Others have raised the question before, but I thought I'd post another request.
Simaril