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Common Question: What is the difference between flooded suction pumps and self-priming pumps? 

1. Flooded Suction PumpsA flooded suction pump is designed to work by being gravity-fed the fluid that is to be pumped. This type of pump does not require a method of priming the fluid.  Typically, in this type of set up, the pump is located at the bottom or underneath a tank or source of liquid. 

2. Self-Priming Pumps:  Are designed to have the ability to prime themselves automatically, when operating under a suction lift, to free themselves of trapped air or gases, and to continue pumping without external priming.