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A detailed buying guide: how to choose a motor pump for clean, dirty or high-pressure water.
This section covers petrol water pumps (motor pumps) for transferring clean, lightly contaminated and dirty water, as well as for delivering water at high head. They are used for irrigating gardens and fields, draining pools, basements and excavations, dewatering construction sites and in temporary water-supply systems. The internal-combustion engine lets you work far from the mains, so motor pumps suit farmers, country-house owners, builders and utility services. For a general overview, see what motor tools and engine-powered equipment are and how to choose them.
Clean-water pumps handle particles up to about 5–8 mm, dirty-water (trash) pumps pass stones and silt up to 25–30 mm, and high-pressure pumps lift water to a great height or push it through a long hose. The wrong type quickly wears the impeller and clogs the pump. Read how to choose a dirty water pump.
Household motor pumps usually have 79–212 cm³ four-stroke engines (2.5–7 hp), while 3–4 inch and dirty-water models use 210–420 cm³ (7–15 hp). A four-stroke engine needs no fuel mix and is better suited to long continuous operation. See differences between two-stroke, four-stroke and diesel engines and engine displacement, power, torque and RPM: how to compare engine-powered equipment.
Flow depends on the port diameter: 1–1.5 inch models move about 6–15 m³/h, 2 inch models 25–36 m³/h, 3 inch models 45–60 m³/h and 4 inch models 80–100 m³/h or more. The rated figure is measured without lift, so calculate the real flow for your hose length and height. More details: how to calculate pump flow rate and head.
Standard motor pumps deliver a maximum head of 20–30 m, and high-pressure models 50–80 m, enough to push water uphill or feed sprinklers. Suction lift is usually 7–8 m; drawing water from deeper requires a submersible pump. For comparison, see how to choose a water pump: types, flow and head.
On the suction side use only a reinforced, non-collapsing hose with a strainer and check valve at the end, and on the discharge side a pressure hose with matching couplings. Check whether fittings, clamps and a strainer are included and what diameter they are.
Fuel tank capacity (1–6 l) and consumption determine run time between refills, usually 1.5–4 hours. A low-oil sensor shuts the engine down to protect it, and an easy-start recoil or electric starter makes starting simpler. Read fuel, engine oil and two-stroke mix: how to choose and use them correctly.
Place the pump on a flat, stable surface as close to the water level as possible, and never run it indoors because of exhaust fumes. Prime the pump chamber with water before starting, and refuel only when the engine is off and cool. See how to safely use internal-combustion-engine tools and equipment and how to use a water pump safely.
After use, flush a dirty-water pump with clean water, drain the pump chamber before winter so it does not freeze, and change the engine oil and air filter regularly. Wear parts such as the impeller, seal and spark plug are best replaced on time. Read how to maintain and store motor tools and engine-powered equipment, how to store a water pump and how to choose spare parts for gasoline and diesel engines.
At ToolsArmenia you can compare petrol water pumps by water type, flow rate, head, port size and engine power and choose the right model for your irrigation or dewatering jobs.
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