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Which valve opens when the downward movement of the diaphragm causes a vacuum in the chamber?(a) Outlet(b) Inlet(c) Both outlet and inlet(d) TransferThis question was posed to me by my college director while I was bunking the class.My question is based upon Petrol Engine Fuel Supply System topic in portion Petrol Engine Fuel Supply System of Automotive Engine Design

Answer»

The CORRECT choice is (b) Inlet

The best explanation: The Downward movement of the diaphragm causes a vacuum in the CHAMBER which causes the inlet valve to open. This vacuum HELPS in the suction of the oil and is one of the most important processes in pump operation.



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