difference for oil pump and gasoline pump

pls do not say siilly . don't pump your engine to work? There is a great difference between the gasoline and the oil pump, and the working principle is different. The gasoline pump is divided into mechanical and electric, the former is used for the carburetor-type automobile, the latter is used for the electronic injection type automobile, the mechanical type is relatively complicated, and it has a shell. And a push rod. The pump membrane. And an oil inlet. And an oil outlet. Oil inlet piston. When the oil outlet piston is closed, the oil inlet piston is closed, the oil outlet piston is opened, and the gasoline flows into the carburetor. Electric is working in gasoline like a submersible pump. The oil pump is relatively simple. which comprises a shell and two gears, wherein an oil inlet and an oil outlet are arranged on the shell, the oil is extruded from the oil inlet to the oil outlet by the meshing of the two gears, the meshing of the two gears is a certain clearance, the size of the gap determines the size of the oil pressure, Different cars have different requirements.