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Which repair practice would defeat that provision?

  • A.Substituting standard fuel hose for a barrier construction, which permits far more permeation than the original
  • B.Fitting ordinary rubber hose in place of the original
  • C.Nothing, since any hose of the correct diameter and pressure rating is suitable for a fuel vapour line
  • D.Only clamps

Answer: B

Standard hose permeates many times more than a barrier construction. The last option explains exactly that, which makes it a correct and more instructive version. Correct part specification matters. The shared behaviour explains why these belong together and the differences explain why both exist. Checking which component actually carries the load settles most questions of this kind at once. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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