How Does Fuel Pump Work on Lawn Mower


The most commonly used fuel is gasoline, but sometimes diesel, oil, etc., are also used depending on the manufacturer’s preference. In this article, I will discuss how does fuel pump work on lawn mower. So let us get started.

A lawnmower is a machine similar to a tractor that helps cut grass (gardening) and other plant growths. It usually consists of two big steel blades that rotate with the help of engine power given by fuel or electricity.

how does fuel pump work on lawn mower

How Does a Lawn Mower Work?

It follows three significant steps for working:

1) When the user starts the engine, the intake valve first sucks air into the cylinder and then compresses it using a piston rod. Then, the spark plug generates a spark that ignites the compressed air/fuel mixture, producing a force that pushes down the piston rod.

2) This falling movement of the crankcase is converted into a rotary motion using a flywheel and a blade attached to the flywheel shaft.

3) When the user engages the drive lever, an outer gear set called transmission gives rotary motion to blades through internal gear, which runs on-the-spot direction changes. Sometimes, an electric starter is used instead of a pull cord mechanism.

How Does Fuel Pump Work on Lawn Mower?

Lawnmowers are one of the best inventions in the world. It helps us to make our work easier, faster, and more efficient. There are many types of lawn mowers available in the market which runs on petrol or electricity. They also vary depending on size, shape, features, etc.

The fuel pump is essential to a lawnmower as it stores the fuel needed to run the engine. The gas tank holds fuel too, but it is not used for starting purposes. Instead, a small electric pump is used.

When you pull the string to start your lawnmower, this tiny pump starts working and takes only 1-2 seconds to take full pressure so that your engine can work properly. The gas pump price varies depending on the quality and type of lawnmower.

The fuel pump takes the tank pressure up to 6 kg, which is sufficient for starting your engine or motor at any time. The gas or petrol is directly sent to the carburetor by this small electric pump.

When you stop your lawnmower, it stops working automatically, but if you want to stop in between then, also it’s good because when you start again, the same process happens, which means it begins in 1-2 seconds with full pressure.

Nowadays, few models of lawnmowers are available, which do not need a fuel pump, so they have taken out the place of the fuel pump for technical purposes.

There are many benefits of using a fuel pump in a lawnmower because they are small, light-weighted, and easy to fit in the lawnmower. You only have to purchase a fuel pump because you need a lot of practice to pull the starting cord perfectly.

The experience takes time, so you must keep patience while learning how fuel pumps work on lawnmowers.

Guide on How to Clean Lawn Mower:

Guide on How to Clean Lawn Mower

1.  Remove the spark plug and remove it from the mower to prevent accidental starts.

2.  Check the air filter and replace it if necessary.

3.   Use a screwdriver and garden hose to clean the clippings under the deck, motor housing, etc. You can also take off some parts such as air filters or blades to make your job easier.

4.  Remove grass and plant debris from electric components such as wiring harnesses, solenoid switch, speed control lever, choke coil, and carburetor gaskets with a brush or worn-out toothbrush soaked in gasoline (be sure to discard after use).

5.  Clean all metal parts with a wire brush to remove all corrosive materials.

6.  Put on rubber gloves and use a cloth soaked in an engine degreaser to wipe down all greasy surfaces such as the deck, mower housing, spark plug, wiring connectors, and carburetor. You can also soak some rags in an engine degreaser and leave them on the stains overnight to help loosen dirt and debris.

7.   After removing any oil or grease patches left by the rag, use engine degreaser solution or a prepared water mixture (2:1) of automatic transmission fluid and water for final cleaning of plastic covers, wrappings, or hoses. Cover them with masking tape before spraying to prevent stripping paint from exposed metal parts.

8.  After you finish cleaning all the metal and plastic parts, wipe them down with a clean cloth and let them dry completely before you put the lawn mower back together. Reassemble the lawn mower in the reverse order of the removal process, and test it for any leaks or abnormal noises before you start it up again..

You Can Check It Out to Wire a Fuel Pump Relay

Safety Guidelines While Using a Lawn Mower:

Always wear long pants, boots, and gloves while using a lawnmower

Always wear safety glasses.

Start the lawnmower in an open space, never in a closed or semi-enclosed area (i.e., garage).

Keep children and pets at least 50 ft away from the mower to avoid injury. Never allow them to ride on it or operate it.

Be aware of where you are mowing, and don’t cut near trees, which could hide obstacles that can damage your blade or undercarriage. Also, be mindful of soft ground areas like ditches; your blades may not be able to pull the machine out if stuck in these areas.

Finally, when backing up with a riding mower, always look behind you to know what’s there when turning around in tight places.

Always wear long pants, boots, and gloves when operating a lawnmower. Avoid loose clothing that can become tangled in the lawnmower’s blades or exhaust system. When operating a leaf blower or other power-vacuum equipment, wear goggles, hearing protection, and a dust mask for eye and respiratory protection.

If you have to cross gravel driveways, roads, etc., do so at right angles and never back up or change directions on them.

If possible, avoid areas with broken glass and nails as these things can damage your tires and cut your grass bag, which lets all those little pieces fall out into your yard, making it look messy after you cut it instead of lovely clean stripes from side to side.


I hope this article has helped you learn how fuel pumps works on lawn mowers. Ensure all the safety precautions while using a lawnmower. Thank you, and have a nice day!

You Can Check It Out To Test Purge Valve Without Vacuum Pump

Jennifer Branett
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