Flooding Protection System
When the ignition is switched to "ON", but the engine is not cranking, the fuel pump will run for 2 seconds to raise the pressure in the fuel rail and then automatically shut off. Only after the engine has started cranking is the fuel pump turned on again.
All fuel pump switching is controlled by the electronic control unit. This system prevents flooding in case any of the injectors become faulty by remaining open when the ignition is left on.