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HomeRepair HelpCub Cadet Mower RepairCub Cadet Lawn mower starts then stalls Repair
Cub Cadet Lawn mower starts then stalls
If your Cub Cadet lawn mower starts then stalls, the most common problem is a clogged carburetor caused by old fuel that has turned sticky and restricted fuel flow. This is a very common reason a lawn mower starts then dies, runs then shuts off, or only runs for a few seconds. Start by checking the carburetor and cleaning it with carburetor cleaner. If that does not fix it, rebuild it with a carburetor repair kit or replace the carburetor. Next, check for stale or bad gasoline, since old fuel often causes the same carburetor blockage. After that, inspect the fuel cap vent. If the vent is plugged, the tank can develop vapor lock and starve the carburetor, so the engine starts and then stops. Try loosening the fuel cap slightly to test it. If the mower still stalls, inspect the spark plug for cracks, carbon buildup, or electrode damage, and use a spark plug tester to confirm it is producing a strong spark. Enter your Cub Cadet model number on RepairClinic.com to find the exact carburetor, fuel cap, spark plug, or other replacement part that fits your mower.
01 - Cub Cadet Lawn Mower 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.
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02 - Cub Cadet Lawn Mower 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.
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03 - Cub Cadet Lawn Mower 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.
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04 - 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.
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05 - Cub Cadet Lawn Mower 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.
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Frequently Asked Questions
Why does my Cub Cadet lawn mower start then stall?
My Cub Cadet lawn mower only runs for a few seconds. Is bad gas the problem?
How do I tell if the fuel cap is making my Cub Cadet mower starts then stalls?
Can a spark plug cause a Cub Cadet lawn mower to start and then die?
How do I find the right Cub Cadet carburetor, fuel cap, or spark plug for my mower?
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