If the noise you are hearing is a crackling noise from the turbine, it is unburnt fuel boiling away.
Check all the settings of the turbine with your GSU to see they are ok. I had an ECU that became corrupted & the turbine would not start.
Clean all the fuel filters. Check the vent pipe to your fuel tank is not blocked. Disconnect the fuel supply to the turbine & run the pump manually & check the fuel flow.

Regards