Spreetail Blog

Why Won’t My Lawn Mower Start?

Top 3 Reasons Your Lawn Mower Won’t Start


by Kaiti Hill
Mar 20, 2019

Winter is over, and it’s time to swap out the snow blower in for the lawn mower. Whether your lawn mower won’t start after winter, or just after a couple weeks without use, here’s the troubleshooting steps you should take to get your mower back up and running.

Check the Gas

Gasoline may not have an expiration date, but that doesn’t mean it’s good forever. If you left gasoline in your mower during the off season, it may be past its prime. Remove what you can of the old gasoline by siphoning it out. To siphon out old gasoline follow our step by step guide below.

Step 1: Find a gas can or another closed container to siphon the gas into.

Step 2: Find or purchase clear plastic tubing 1 inch in diameter.

Step 3: Set the gas can on the ground near the opening for the car’s gas tank.

Step 4: Feed both tubes into the tank.

Step 5: Use a rag to create a seal around the tubes.

Step 6: When ready, force air into the short tube.

Step 7: Monitor the flow of gas.

Step 8: Once gas is freely flowing from the tank, you don’t need to continue blowing, gravity will do the rest.

Step 9: Remove the tubes and close the gas tank.

If low gas or old gas isn’t the problem, there could be another gas-related issue. Over time, gas residue can build up and clog your mower’s carburetor. Try cleaning the carburetor. If your carburetor’s air to fuel ratio is off or the engine is too hot, replacing your carburetor may be necessary. To clean your carburetor first check to see if the air coming into the carburetor is clean and free of debris by inspecting the air filter. Next use carburetor cleaner, this comes in commercially convenient spray cans. Be sure to clean your carburetor frequently for regular maintenance.

Check the Spark Plug

Spark plugs are the part of your mower that allow it to run. They’re the middlemen between the fuel and the engine. The spark plug is a common source of lawn mower troubles. Often times, spark plugs become loose or dirty. Check your spark plug to see what sort of state it’s in. If it’s loose or dirty, you’ll need to tighten or clean it. To safely clean your spark plug, you should use a wire brush or spray-on plug cleaner specifically designed for ignition part. You can also use a sturdy knife to scrape off tough deposits. Spark plugs generally need to be replaced every year, so it could be time for a new plug.

Check the Battery

Most lawn mower batteries last anywhere from 3 to 5 years. If your lawn mower’s battery appears to be dead, you can try charging it for a few hours. Older lawn mower batteries and lawn mower battery chargers can release unsafe fumes, so it’s important that you don’t overcharge your battery. Check your owner’s manual to check how long you should charge your lawn mower battery for. If charging your battery doesn’t give you any good news, you’ll need to replace the battery.

When working on your lawn mower and performing maintenance, you should always refer to your mower’s owner’s manual.

Lawn mower still won’t start? Talk to our lawn & garden experts 24/7 at 833-777-3382, [email protected], or live chat us down below. Be the first to know about new products and can’t-miss promotions by signing up for our newsletter at the bottom of the page.