Question

Which system experiences  Vapour locking in the fuel system?

(a) A.C mechanical pump

(b) S U electrical pump

(c) Both A.C mechanical pump and S U electrical pump

(d) Electrical pump

The question was posed to me in my homework.

My question is based upon Petrol Engine Fuel Supply System topic in portion Petrol Engine Fuel Supply System of Automotive Engine Design

Answer 1

Correct answer is (a) A.C mechanical pump

The best explanation: Since the A-C pump is situated close to the engine due to which they are exposed to engine heat, which may result in vapor locking in the fuel system. Which is taken care of by the diaphragm return spring.