If there is no fuel oil consumption from the fuel oil supply system the supply pumps must be stopped in order to avoid damage of the pump due to high temperature.The supply pump will stop when the casing temperature is raised to 135°C. and can be started again when the temperature is lowered again.It can be necessary to stop the pump and only circulate the oil through the heater with the booster pump, or to change the return select valve to return to service oil tank so the flow is maintained to cool down the supply pumps casing temperature. Normally when the diesel generators are supplied from the fuel oil system, there will be no problems.