Problems when starting a self-priming pump and solutions

Self-priming pumps with a pre-filling chamber can operate without installing a check valve at the end of the pipe. These pumping units are convenient for unloading tanks with oil products, diesel fuel, petrol, oil and other liquids.

The ability to suck in liquid is ensured by the built-in check valve and the design of the pump casing, which stores a certain level of liquid to start the pump. However, for the first start, there still needs to be liquid in the working chamber, so you will have to fill it up the first time. For this purpose, a filler connection is provided on the casing (see Fig. 1 item 4, Fig. 2).

The table below shows typical faults that may occur during operation of a centrifugal self-priming pump and how to resolve them.