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

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

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Automobile Engineering in ME
The difference between DOT 3 and DOT 4 brake fluids is

DOT 4 fluid is more resistant to freezing than DOT 3 fluid
DOT 4 fluids have a lower boiling point than DOT 3 fluid
DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
DOT 4 fluids have a higher boiling point than DOT 3 fluid

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