Easy to use. The gasoline pump in Jianya pump industry is very easy to use because of its good quality. Graf is a small brand of multi-stage pumps, which belongs to Zhejiang Jianya Pump Co., Ltd. and is a leading well-known enterprise in the industry. The produced pump has high power and long service life. The gasoline pump is a centrifugal pump. Its working principle is that the engine drives the impeller to rotate and produce centrifugal force. Under the action of centrifugal force, the water in the impeller groove flows into the pump casing, so the pressure in the center of the impeller decreases, and the pressure is lower than that in the water inlet pipe, and the suction groove flows into the impeller. In this way, the pump can continuously absorb water and supply water.