Which of the following pumps definitely does NOT need priming?

A submersible pump operates by being fully submerged in the liquid it is intended to move, which allows it to create pressure and direct fluid flow without the need for priming. This design means that the pump is always filled with fluid, facilitating its operation. As a result, submersible pumps can effectively start and run without any additional steps to remove air from the pump or its lines, unlike other types of pumps that may require priming to eliminate air and ensure that the pump can effectively move fluid.

In contrast, jet pumps, deep well pumps, and shallow well pumps typically utilize a mechanism that relies on creating a vacuum to draw water into the pump. This process necessitates initial filling and purging of air, commonly referred to as priming. Consequently, these pumps must have water supplied to them prior to starting to ensure they can function correctly.