Which method is used to pull water up through the suction hose and out the discharge hose?

The correct method for pulling water up through the suction hose and out through the discharge hose is the vacuum function. This method utilizes a difference in pressure to create suction, effectively drawing water into the pump from the source through the suction hose. When the pressure inside the pump is reduced compared to the atmospheric pressure, the external pressure pushes the water into the pump, allowing it to be expelled out through the discharge hose.

Understanding the vacuum function is essential, especially in marine environments, where effective pumping is crucial for various operations, including firefighting and dewatering. While centrifugal force, pressure pumping, and gravity flow are important concepts in fluid dynamics, they operate under different principles and are not directly related to the functionality of drawing water through a suction system in this context.