If the amber light is on your out of sequence supplying fuel to engines initually. If you follow Rick's B52h manual and turn the outboard switches off until you have green bands showig; the light stays off. I still haven't got it right but I've been flying with way less fuel for short flights. I'm trying to estimate the correct range and fuel loads.

It's not all correct because some fuel is used out of the tip tanks even with the switches off.