This made the CNN website:
FAA issues new Boeing fuel pumps order
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">The order, issued Saturday but taking affect Wednesday, requires airlines flying Boeing 747s, 757s and next-generation 737s to keep enough fuel in the center fuel tank to keep the suspect fuel pumps submerged.</font>
There is also a directly related thread in the
CX forum.
I imagine this means more variability for loading and interim refueling stops on the longer longhaul flights.