Hope this clears it up.
FUEL QTY LOW Caution Msg Number: C28001 Rev: 0 Basic
ATA: 28 - 41 Fault Code: 284 001 00 Database Version: 000 - 999
Master Caution Light: Yes Chime: No Aural Tone: Yes Latch: Neither AIR nor GROUND
EICAS Inhibits: ESI: Yes Autoland: Yes Comm Msg: Yes
Configurations: PW_GE_RR.I
Inhibits:
Snapshot:
EICAS Logic: FUEL_QTY_LOW_C.1
Condition: Fuel quantity is less than 4500 pounds/2041 kilograms in either L or R main tank.
Msg Description: The fuel quantity processor unit (FQPU) will provide a signal on the left and right system buses if a low fuel condition
exists in either of the main tanks. The FQPU will set the message signal when the fuel quantity of either main tank
decreases below 4500 pounds (or kilogram equivalent) for a period greater than 30 seconds. The message signal
will remain set until the fuel quantity increases above 4700 pounds (2133 kilograms) for a period greater than 15
seconds. EICAS logic is to display message when message signal is set.