Why Won’t My Petrol Lawn Mower Start

Why Won’t My Petrol Mower Start?

Why Won’t My Petrol Mower Start

Why Won’t My Petrol Mower Start: Troubleshooting Tips for Common Issues

Below are the most common reasons why your petrol mower will not start.

  1. Empty fuel tank
  2. Stale fuel
  3. Clogged carburetor
  4. Faulty spark plug
  5. Dirty air filter
  6. Oil level issues
  7. Primer bulb malfunction

As the growing season rolls around, I am always keen to start tending to my garden, in particular, ensuring the lawn looks its best. There’s a palpable sense of frustration, however, when the petrol mower stubbornly refuses to roar to life after its winter slumber. Happily, most of the common issues that prevent a petrol mower from starting can be resolved without much fuss in the comfort of one’s own shed or garage.

Often, the problems are quite identifiable and manageable, with solutions readily at hand for the avid gardener. Whether it’s routine maintenance that has been overlooked or a specific part needing attention, understanding how to troubleshoot these issues can save both time and the expense of professional repairs. Such knowledge is essential for anyone seeking to maintain their lawn with reliability and efficiency.

Key Takeaways

  • Troubleshooting a non-starting petrol mower is often manageable at home.
  • Regular maintenance is key to preventing common starting problems.
  • Understanding mower issues saves time and avoids unnecessary repair costs.

Getting Started With A Petrol Mower That Won’t Start

Air Filter Is Clogged

Petrol Mower Air Filter Is Clogged

I always check my mower’s air filter for blockages before attempting a start-up. Clogged with dirt and grass clippings, a blocked filter impedes airflow to the carburettor, causing starting problems. Regular inspection and cleaning are crucial, and I’m mindful of eventually replacing the filter after its serviceable lifespan is exceeded.

Problems With The Spark Plug

Issues with the spark plug are not uncommon in my petrol mower maintenance routine. Regular checks for dirt accumulation or signs of wear are essential. If a clean does not solve the problem, I know it’s time to replace the plug. Ensuring that it is also securely connected is a key step in the troubleshooting process.

Starter Solenoid May Be Faulty

Should I turn the ignition and hear a distinct clicking sound, I immediately suspect a starter solenoid fault. Repairing this may be complex, so in my experience, opting for a straightforward replacement is usually the best course of action.

Engine Not Receiving Fuel

Engine Not Receiving Fuel

When my mower doesn’t start, I ascertain that fuel reaches the engine. The issue might stem from a clogged air filter or other fuel delivery obstructions. I sometimes gently tap the carburettor to stimulate fuel flow but first ensure no blockages in the lines or dirt accumulation.

Compression Testing

I am aware that testing engine compression may require professional help, as it involves using a compression tester in place of the spark plug. Not typically available at home, this device measures the engine’s compression capabilities necessary for proper function. If I suspect compression issues, I seek specialist advice and services to resolve them.


I have assessed numerous factors that contribute to the efficiency of petrol lawn mowers. It is evident that, in some cases, these machines may indeed reach the end of their effective lifespan. When a lawn mower ceases to operate, one must weigh the practicality of attempting repairs against the benefits of purchasing a new model. I recommend visiting trusted sources to find the best petrol mowers available. Utilising a lawn mower selection tool could significantly streamline the process, ensuring that one chooses a mower well-suited to both their personal requirements and the specific demands of their lawn.

Do You Need Help With Choosing The Perfect Petrol Lawn Mower?

I recognise that picking the ideal petrol lawn mower for your garden can be a daunting task. With my extensive background in garden power tools, I’m here to guide you through this process. By clicking the image below, you’ll access a selection tool that determines the best petrol lawn mower for your needs within seconds.

Find Mower Banner Mobile

When considering your options, it’s important to weigh up the pros and cons of various types of mowers, such as electric mowers, which can be a quieter and more environmentally friendly option but may not offer the same power as petrol models.

  • Look for mowers that will handle the size and terrain of your lawn.
  • Determine the features important for your use, such as mulching capabilities or an adjustable cutting height.
  • Consider the mower’s ease of maintenance and storage requirements.

My goal is to assist you in finding not just any mower, but one that aligns perfectly with your garden’s specific demands and your personal preferences. With over a decade of experience in working with a wide array of lawn mowers, I am poised to offer expert advice that will save you time and effort in your selection.

Frequently Asked Questions

What could cause a petrol lawn mower to cut out shortly after starting?

  • Fuel Problems: If I find my mower cuts out shortly after starting, I check if there’s stale fuel or a clogged fuel line.
  • Air Flow Issues: A dirty air filter can impede engine performance. Cleaning or replacing the filter is often a solution.
  • Spark Plug Trouble: A faulty or dirty spark plug can cause the engine to stop. Inspecting and changing the plug if necessary is advisable.
  • Engine Overheating: Insufficient engine oil can lead to overheating and subsequent shutdown. Ensuring proper oil levels is crucial.

What should I check if my lawn mower is cranking but fails to start?

  • Spark Plug: Checking the condition and connection of the spark plug is my first step.
  • Carburettor: A blocked carburettor can prevent the engine from starting. It may need cleaning or adjustment.
  • Fuel Flow: Verifying that fuel is reaching the engine is key. I check for any blockages or leaks in the fuel system.
  • Ignition Coil: Testing the ignition coil with a multimeter can determine if it’s working correctly.

What are common issues with Mountfield petrol lawnmowers failing to start?

  • Ignition Switch Problems: A malfunctioning ignition switch on my Mountfield mower can prevent starting.
  • Fuel Stabiliser: Without a fuel stabiliser during long storage periods, fuel can degrade and cause starting issues.
  • Battery Issues: For electric start models, I make sure the battery is charged and connections are secure.

What steps should be taken when a new petrol lawn mower doesn’t start?

  • Check Assembly: I make sure the mower has been assembled according to the manufacturer’s instructions.
  • Oil and Fuel: Verifying there’s fresh fuel and correct oil level is essential before attempting to start the mower.
  • Safety Features: I ensure all safety features like the handlebar lever are fully engaged as they can prevent starting.
  • Consult the Manual: When in doubt, referring to the lawn mower’s user manual can provide model-specific troubleshooting steps.

How can I troubleshoot a Briggs and Stratton lawn mower that won’t start?

  • Air Filter Inspection: A clean air filter is vital for proper engine performance. A replacement is simple if it’s dirty.
  • Fuel Quality: If the petrol is older than 30 days, it might be stale. I’d replace it with fresh fuel.
  • Electrical Connections: Checking the spark plug wire connection and the condition of the plug itself is a good practice.

What are the procedures to resolve starting problems with an Einhell petrol lawn mower?

  • Primer Bulb: I press the primer bulb several times to ensure the carburettor is primed before starting.
  • Fuel Cap Vent: Ensuring the fuel cap vent isn’t blocked allows for proper air flow into the fuel tank.
  • Choke Position: Starting a cold engine typically requires the choke. I make sure it’s in the correct position before starting.
Lawnmower Product Expert, Reviewer and Author at EasyLawnMowing.co.uk | 01284 615144 | info@easylawnmowing.co.uk | Website | + posts

As a seasoned expert in the field of garden power tools, I have dedicated over a decade to working with and reviewing a wide variety of lawn mowers. My extensive experience has allowed me to gain a deep understanding of the benefits and limitations of different types of mowers and garden tools.

Over the years, I have honed my skills in writing informative articles and creating helpful videos for various blogs and publications. This has given me the ability to not only recognise what makes a good lawn mower, but also to help you choose the perfect garden tool for your specific needs and requirements.

With my wealth of knowledge and expertise, I am confident that I can provide you with valuable insights and recommendations when it comes to selecting the right lawn mower for your lawn. So, whether you're looking for a battery cordless, electric, petrol, or robotic mower, you can trust in my expertise to guide you towards the best option for your garden.

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