Is not fuel burn a derivative of fuel flow, eg...400kg/h? In all my years I have never heard of fuel burn being "measured near the nozzles in the engine". Could you please elaborate.
I meant the fuel flow transmitter is located near the nozzles and from that the fuel burn is derived.
About the pouring back , could be an old wives' tale I have just taken for granted. The technical description does not seem to support it.