What Happens When Wrong Gas is in Lawn Mower?

It is the goal of every homeowner to maintain a perfectly managed lawn. A well- kept lawn adds to the property’s aesthetics and keeps weeds and pests at bay.


Maintenance of extensive lawns may be overwhelming if done manually.

Special equipment has been developed to reduce the effort and time required to maintain yards.

One such equipment commonly used to maintain grass in the desired size is a lawnmower.

A lawnmower, as with any other lawn equipment, is run by a motor engine. The internal combustion engine of a lawnmower burns gasoline as fuel.

The energy derived from this process is used to power the equipment enabling rotation of the cutting blades and movement of the equipment around the lawn. Oil is also required to lubricate the moving metallic parts of a lawnmower.

What happens if you put the wrong gas in a lawnmower?

In modern homes, there are several types of gasoline-powered equipment. Since each piece of equipment require a specific type of gasoline, your garage shelves or any other storage space may feature various kinds of gasoline.


The probability of switching and adding the wrong gas in a lawnmower is high. Both four-stroke and two-stroke lawnmowers use unleaded gasoline with an octane rating of 87 and higher.

The two-stroke lawnmowers additionally require engine oil.

Putting the wrong gas in a lawnmower will not cause permanent or long term damage to its component.

However, you may experience problems when starting the machine.

Many people who have used plain or wrong gas for a lawnmower report that the equipment is likely to die before you are done with the intended job.

It is worth noting that your lawnmower blades require an optimum amount of energy to work efficiently. If the burning of the wrong gas provides less or more energy than needed, mowing may be inefficient.

If the wrong gas is used for a long time, it may damage the rotating blades due to changes in the engine’s energy supply.

What are the dangers of using the wrong fuel in a lawnmower?

If you use the wrong gas for a lawnmower, your engine components are exposed to the risk of damage. Different fuels have distinct amounts of ethanol.

If the gasoline contains more than 10% of alcohol, it may damage the spark plug of the motor engine and the fuel bowls near the carburettor.

Harmful emissions can also be produced by burning the wrong gasoline with a lawnmower. The emissions may be detrimental to the lawn and the surrounding environment.

How to remove the wrong fuel from a lawnmower

The fortunate thing with switching gasoline in a lawnmower is that it can be easily remediated.

While some lawnmowers can still run on the wrong gas, it is advisable to clean the fuel to the last drop to avoid damaging the gasket and other engine components.

Follow this procedure to remove the wrong oil and prevent potential damage to your lawnmower.

  •  Locate the fuel tank and the fuel line connection to the tank- Many mowers have their fuel tank placed under the seat or under the hood. A fuel line connection is found on the bottom of the fuel tank.
  • Secure a container to collect the fuel from the fuel tank- This is only possible if the fuel tank line connector is reachable. If this is not the case, the connector to the engine should be used.
  • Disconnect the fuel line from the fuel tank or engine- This should be done by squeezing the clamp on the connector with the help of pliers.
  • Drain the wrong fuel- To do this, open the capping component of the fuel system and allow the gasoline to drain completely.
  • Remove and clean the fuel bowl- As discussed earlier, this is one of the components at risk of damage if the wrong fuel is used. Use a wrench to unscrew and remove the fuel bowl from the carburettor. Clean the fuel bowl by wiping it with a clean towel.
  • Connect the fuel bowl and the fuel line back- Screw the fuel bowl gently until it is tightened back to the carburettor. Reconnect the fuel connector to the fuel tank or engine.
  • Put the proper gas to the fuel system- Add the recommendable fuel to the tank and check for any leaks. Leaks are signs of an inadequate tightening of components earlier disconnected.

On ignition of the lawnmower, smoke may be emitted, especially if the fuel tank was not drained completely. The burning of the gasoline mixture should only take a few minutes and hence the emission should not take long.

If you accidentally add the wrong gas to your lawnmower, all you need to do is drain and clean the contact components.

Do not let your lawnmower sit in your garage for long with the wrong gasoline, as this can cause severe damage to the equipment.

If you feel that the disconnection process is overwhelming, It would help if you seek assistance from a lawnmower expert in your locality.