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A purge valve that never opens leads to which condition?

  • A.Nothing
  • B.Failure to clear the canister, so it eventually saturates and vapour escapes to the atmosphere or is smelt
  • C.A saturated canister and possible fuel smell
  • D.A rich mixture, which follows from the vapour being unable to escape and therefore accumulating in the manifold

Answer: C

A canister that is never purged eventually saturates. The last option explains exactly that consequence, which makes it a correct and more instructive version. A rich mixture indicates the opposite fault. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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