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Which pump supplies that pressure?

  • A.The in tank electric pump, which is capable of the pressure required by a direct injection system when commanded
  • B.A gear pump
  • C.A single piston pump driven by a lobe on the camshaft, whose delivery is metered by a solenoid valve at its inlet
  • D.A camshaft driven high pressure pump

Answer: D

A camshaft lobe drives a plunger pump whose delivery is metered by an inlet valve. The last option describes exactly that construction, which makes it a correct and specific version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared behaviour explains why these belong together and the differences explain why both exist. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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