an electric motor for a fuel pump is provided with a shutdown switch positioned intermediate an inverter , and its control coil . in this location , the shutdown function can be achieved without heavy components . in another feature , when the fuel pump is shut down , a signal is sent upstream to a voltage regulator associated with a generator , such that the voltage supplied downstream by the generator can be reduced to eliminate any potential voltage spike due to the shutdown of the electric motor . the electric motor with shutdown switch enables low weight fault tolerant flux regulated machines .