Techniques are described to replicate multicast packets in accordance with a hierarchical data structure. Furthermore, fuel pulsation damping means is formed between the fuel filter and a flow-out chamber formed below a filter element in the fuel filter andor a fuel pressure control valve which is an adjacent portion to the flow-out chamber. current source and fan activation IC. The reference-value determining unit updates the reference-value with a different reference-value when the condition determining unit determines that the predetermined condition is satisfied.