Fuel record (3)
I believe the answer is:
log
I believe this clue is a double definition.
'fuel' is the first definition.
(log is a kind of fuel)
'record' is the second definition.
(I know that log is a more specific form of the action record)
(Other definitions for log that I've seen before include "Piece of wood for the fire" , "Chunk of wood" , "Official record of events" , "Record; cut wood" , "Formal record" .)