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My Lawn Mower Starts then Stops

It’s a terrible feeling when your lawn mower won’t stay running. You get the sense neighbors are saying, “Looks like he’s is mowing the lawn. Now he’s not. Wait, he’s mowing, again. Oh, now he’s not.” If your lawnmower starts then dies, don’t write its obituary quite yet. Maybe you already tried everything you know: starter fluid, fresh gas, clean oil. Problem is, those are all Band-Aids. Repair Clinic can help you breathe new life back into your carburetor and get those blades spinning again. Work your way down the list of causes below to find the problem. We take a systematic approach to diagnostics, so you know you’re buying the right part to make the right repair.
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Common solutions for: Lawn mower starts then stalls
Solution 1:
Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate,... leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
Required Part
Lawn Mower Carburetor
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Solution 2:
Carburetor Repair Kit
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate,... leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
Required Part
Lawn Mower Carburetor Repair Kit
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Solution 3:
Fuel Cap
As fuel is consumed by the engine, the level in the fuel tank lowers. To make up for this, the fuel cap uses a small vent to allow air to enter the tank. If the fuel cap vent is clogged, air won’t be ...able to enter the tank and a vacuum or “vapor lock” will occur. This stops the flow of fuel to the carburetor causing the engine to stall. To determine if the fuel cap vent is clogged, try slightly loosening the cap and then starting the engine. If loosening the fuel cap allows the engine to stay running it is likely clogged and will need to be replaced.
Required Part
Lawn Mower Fuel Cap
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Solution 4:
Old or Bad Gasoline
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
Solution 5:
Spark Plug
Inspect the spark plug for signs of wear or damage. If the porcelain insulator is cracked, an electrode is burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark ...plug. To determine if the spark plug is defective, use a spark plug tester. You should see a strong spark between the tester’s terminals when the engine is cranking. If there is no spark, this indicates that the spark plug is defective and should be replaced.
Required Part
Lawn Mower Spark Plug
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