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

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

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Automobile Engineering in ME
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Reduces the amount of kickback for large steering angles
Makes the steering more responsive
Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
Allows the steering wheel to be turned by a greater amount when steering

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