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Which everyday event commonly triggers an evaporative system code?

  • A.A full fuel tank, which prevents the system from drawing a vacuum and therefore causes the test to record a failure
  • B.Cold weather
  • C.A fuel filler cap that has not been tightened correctly, which allows air to enter and the test to record a leak
  • D.A loose or missing fuel filler cap

Answer: D

The cap is part of the sealed system and a loose one fails the leak test. The last option states the same cause in more words, which makes it a correct restatement. Refuelling conditions genuinely inhibit the test. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.

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