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Which method tests the system for leaks?

  • A.Applying vacuum or pressure and watching for decay
  • B.A visual inspection, which reveals any leak within the fuel system and is therefore sufficient for the purpose
  • C.Nothing
  • D.Sealing the system and observing whether an applied pressure or vacuum is held for the prescribed period

Answer: A

Sealing and watching the decay is how the leak monitor works. The last option describes exactly that method, which makes it a correct and more detailed version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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