On all ATR:
Fuel filter/heater assy upstream of HP fuel pump/HMU to prevent icing of the fuel.Engine oil is used for fuel warming,the sensor for fuel temp is located here as well.
With a stopped engine the temp indication is rising due to no more flow.
Often problems with the thermostat inside the assy,will lead to move the pointer out of the limit.Still nothing to do with Hotstart !
On ATR with newer PW 124 and all PW 127 engines there is an
additional Fuel cooled oil cooler (FCOC) installed.
It is downstream of HP fuel pump/HMU using high pressure fuel (metered)
to cool the oil going to the Reduction gearbox.(Higher loads from the
stronger engines).
No temperature indication from this assy.