Practice question

What is the key difference between Multi-Point Port Fuel Injection (PFI) and Direct Injection (DI) in a petrol engine?

  1. Port injection sprays fuel into the intake manifold before each cylinder; direct injection sprays fuel directly into the combustion chamber
  2. Port injection uses diesel fuel; direct injection uses petrol
  3. Port injection does not require a fuel pump
  4. Direct injection does not require spark plugs

Answer: A — Port injection sprays fuel into the intake manifold before each cylinder; direct injection sprays fuel directly into the combustion chamber

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