The 8-inch gasoline-driven water pump is a widely-used equipment in agricultural irrigation and drainage, as well as industrial drainage. Its working principle is based on the fundamental mechanism of centrifugal pumps. This pump is powered by a gasoline engine, causing the impeller to rotate and generate centrifugal force. As the impeller rotates, the water in the impeller channels is subjected to centrifugal force and is ejected towards the pump casing. This results in a decrease in pressure at the center of the impeller. The pressure here is lower than that in the intake pipe, so water flows from the sump into the impeller due to the pressure difference. Thus, the pump can continuously suck and supply water.