High pressure fuel pump and transformer: what they have in common

1. Step 1. High pressure fuel pump — is part of — Diesel engine. It delivers fuel to the injectors.
2. Step 2. Diesel engine — is part of — Truck. A diesel engine.
3. Step 3. Truck — evolved into — Ambulance. A special-purpose vehicle.
4. Step 4. Ambulance — has part — Defibrillator. A defibrillator.
5. Step 5. Defibrillator — has part — Transformer. Stepping up the voltage.

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