Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Enable the pump's fault diagnosis function to operate
Pressurise the fuel system before the engine is started
Supplies a large amount of fuel and thereby creates a choke effect
Warm up and lubricate the pump

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Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
It blows air through the radiator when necessary
It draws heat out of the engine compartment
It cools the engine by blowing air onto the cylinder block

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