There are CDS fuel alert for:
选项：

A:
A:Fuel quantity low in the main tank, impending fuel filter bypass, excessive fuel flow difference between engines
B:
B:Fuel quantity low in the main tank, both center tank fuel pumps producing low or no pressure with fuel in the center tank, excessive fuel quantity difference between main tanks
C:
C:Fuel quantity low in center or main tank, either center tank fuel pump producing low or no pressure with fuel in center tank, excessive fuel flow difference between engines
D:
D:Any fuel pump producing low or no pressure with the pump switch ON, impending fuel filter bypass, excessive fuel quantity difference between main tanks.