If that generator is wye connected wouldn't we be required to bring the neutral to the service disconnecting means and bond it pursuant to 250.24 (B). The reason that I bring that up is it is very common to use one generator to supply several emergency loads of which the fire pump is just one. In such a case the generator will be wye connected in order to supply the emergency lighting loads.
"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison