The harbor tug to which you are assigned has...

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Question 1 of 2066636eef28f7522a1c51fad9

The harbor tug to which you are assigned has a main engine fuel system as shown in the illustration. Besides preventing the attached fuel oil pump and the hand priming fuel oil pump from discharging through the other, what other purpose do the anti-flood check valves serve? Illustration MO-0152

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Question 1 of 20

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🔍 Key Concepts

• Anti-flood check valves only allow fuel to move in one direction, blocking reverse flow. • Think about gravity head: which way will fuel try to move if the day tank is above vs. below the engine when the pumps are not running? • Consider what happens to the fuel system when the engine is shut down: do you worry more about flooding the engine or losing prime back to the day tank?

💭 Think About

• Look at the arrows on the illustration and trace the fuel path from the day tank, through the pumps, to the engine, and then imagine the pumps stopped. Which way could fuel try to flow on its own? • In which situation would you need a check valve to keep the engine fuel manifold full instead of letting fuel drain back to the tank? • The name "anti-flood" hints at what problem they are really protecting against. Is the danger flooding the engine from a high tank, or draining the engine back to a low tank?

✅ Before You Answer

• Verify which side of each anti-flood check valve faces the engine and which faces the day tank in the diagram. • Decide whether flooding would occur when the day tank is higher than the engine or lower than the engine, with the engine stopped. • Decide whether the unwanted flow they prevent would occur when the engine is running or when it is shut down; match that condition carefully to the answer choices.

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