Question 103Motor Plants - QMED

The correct answer is C) The unconsumed fuel is recirculated back to the mixing tank (if fitted) or to the day tank. In an HFO (Heavy Fuel Oil) service system, the unconsumed fuel from the main propulsion diesel engine is typically recirculated back to the mixing tank or the day tank. This allows the unused fuel to be reused, improving the efficiency of the fuel system. The other options are incorrect because the unconsumed fuel is not recirculated back to the fuel injection pumps, the settling tank, or the booster pump suction. The recirculation back to the mixing tank or day tank is the standard practice to ensure the efficient utilization of the HFO in the system.