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Which symptom does a fault in that system produce?

  • A.A refusal to unlock the flap, since the controller will not release it until the tank has been depressurised
  • B.The filler flap will not open on request
  • C.Nothing, since the flap is mechanical and therefore opens regardless of the state of the vapour system
  • D.Only a code

Answer: B

The flap stays locked until the tank pressure has been released. The last option explains exactly that interlock, which makes it a correct and more instructive version of the same answer. Naming what changes and what stays the same is the reliable route through questions of this shape. The shared behaviour explains why these belong together and the differences explain why both exist. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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