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In which system the pump starts to operate immediately as the ignition is switched on?

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in Automotive Engine Design by (137k points)
In which system the pump starts to operate immediately as the ignition is switched on?

(a) A.C mechanical pump

(b) S U electrical pump

(c) A.C mechanical pump & S U electrical pump

(d) Mechanical pump

I had been asked this question in class test.

This intriguing question originated from Petrol Engine Fuel Supply System in division Petrol Engine Fuel Supply System of Automotive Engine Design

1 Answer

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Correct answer is (b) S U electrical pump

The best I can explain: In an S U electrical pump the electric pump needs not to wait for the engine to start. It starts to operate immediately as the ignition is switched on. Whereas the A-C mechanical pump does not have this advantage.

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