Why is a plug in the external bypass part of two pipe fuel pump?

Why is a plug in the external bypass part of two pipe fuel pump?

• A. To allow the oil to return to the tank
• B. To vent air
• C. To increase pressure
• D. To cool the pump

Answer: (A)

In this type of fuel pump, there’s an external bypass that provides a return path for excess oil back to the tank. The plug in that bypass is there to enable that return flow so the oil can circulate back to the tank. This keeps the pump from building up unnecessary pressure, helps maintain proper lubrication, and prevents overheating by allowing continuous circulation. The other options don’t describe the purpose of the bypass return path: venting air, increasing pressure, or cooling are not the primary roles of this bypass return.

In this type of fuel pump, there’s an external bypass that provides a return path for excess oil back to the tank. The plug in that bypass is there to enable that return flow so the oil can circulate back to the tank. This keeps the pump from building up unnecessary pressure, helps maintain proper lubrication, and prevents overheating by allowing continuous circulation. The other options don’t describe the purpose of the bypass return path: venting air, increasing pressure, or cooling are not the primary roles of this bypass return.