The suction port assembly does what

• A. Regulates fuel quality
• B. Stops backflow
• C. Controls the liquid supply to the pump body suction port, and is also where fuel enters the volute
• D. Maintains vapor pressure

Answer: (C)

The suction port assembly is the inlet path that feeds fuel into the pump. Its job is to control how much liquid enters the pump body on the suction side and to guide that fuel into the volute, where the impeller starts to pressurize it. This setup helps ensure a steady, air-free supply to priming the pump and often includes a screen or filter to keep debris out. Other functions like filtering fuel quality, preventing backflow, or maintaining vapor pressure are handled by different components in the system, not by the suction port assembly.