There is also the concern that in the event of crash itīs better not to have a electric fuel boost pump on spraying fuel everywhere. Hence the fuel boost/primer pumps on B222 & AS350B3 are always turned off after start.
I think thatīs the way modern helicopters are going. No electric fuel pump on during flight. Only suction engine driven pumpīs. I think the S-92 does that?
However in the H-300C series as stated earlier the pump should be on to 450īagl in accordance with the manual and can then be turned off. These boost pumps are expensive. I remember replacing one some years ago at a cost of $2500 USD.
Personally I prefer to have them turned off after start.