2024-03-01 What is a gasoline engine water pump? What are the advantages of gasoline engine irrigation water pumps? Fuel system: including fuel tank, switch, filter, sedimentation cup and carburetor, etc. Cooling system: including cooling fans, draft hoods, etc. Some backpack spray dusters have a cooling port on the rear volute of the large fan, and the cooling airflow is led out by the draft hood, so there is no need for a separate cooling impeller.