Supply oil to the fuel oil system by hand oil supply pump and release all the air through the injector pump and fuel injector's vent screw until the oil overflows and no more air found.

If the pump noise at work, this is often due to low oil temperature, oil viscosity is too high, the oil into the air, or pump coupling loss causes such as excessive wear and tear.

Avoiding the possible counter rotation of the oil pump while starting the machine, otherwise it may lead to the out blown of the axle seal and entering of air.