True or False: Impeller pumps are typically self-priming.

Impeller pumps are indeed typically self-priming, which means they are designed to draw liquids into the pump without needing an external source of priming. This is particularly advantageous in marine applications because it allows for easier operation and maintenance, as the pump can effectively start moving fluid without manual assistance.

The self-priming capability is due to the design of the impeller, which can create a vacuum that pulls liquid into the pump, enabling it to begin pumping as long as there is some liquid available to be drawn in. This feature is valuable in scenarios where the pump may not always be submerged or when there are variations in liquid levels.

While there are some specific models and configurations that might require particular installation practices or maintenance to ensure they operate effectively, the general classification of impeller pumps supports the assertion that they are primarily self-priming.