Correct answer
The low-pressure supply or lift pump.
The supply or lift pump. In this circuit it moves fuel from the tank towards the injection system through the filters. The high-pressure pump brings fuel to the required pressure, and injectors introduce it into the cylinders: these are not all the same component. Layout varies among engines, so the question specifies separate pumps. The piston does not itself draw diesel from the tank.
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The engine piston drawing directly from the tank.
The low-pressure supply or lift pump.
Only the injector, without a supply circuit.
The real exam in English is a translation of the Spanish original; compare both here.
Show the Spanish original
En un sistema diésel con bomba de alimentación y bomba de inyección separadas, ¿qué componente lleva el carburante del depósito al circuito de alimentación de baja presión?
- El pistón del motor, aspirando directamente del depósito.
- Solo el inyector, sin circuito de alimentación.
- La bomba de alimentación de baja presión.(Correct answer)
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