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 pumpI 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

In which system the pump starts to operate immediately as the ignition

1.	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 pumpI 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
Answer» 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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