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HomeRepair HelpRepairSmall engine stops after a few seconds Repair
Small engine stops after a few seconds
If your small engine runs for a few seconds then dies, the most likely cause is a clogged carburetor. Stale or ethanol-blended fuel left in the carburetor is one of the most common root causes on seasonal equipment, including a lawn mower, because evaporated fuel leaves a sticky residue that can block the carburetor passages. Clean the carburetor with carburetor cleaner, then rebuild or replace it if cleaning does not correct the problem. A small engine carburetor repair kit may include the gaskets, needle valve, and other parts needed for the repair. If the engine starts but won't stay running after the carburetor is serviced, check the fuel cap. A clogged fuel cap vent can create a vacuum in the fuel tank and stop fuel from reaching the carburetor. Loosen the cap slightly and restart the engine. If it continues running, replace the fuel cap. These checks address common symptoms such as an engine runs then dies, engine starts then dies, engine stalls after starting, or a lawn mower runs then dies. Enter your model number to find the exact replacement carburetor, repair kit, or fuel cap for your specific engine.
01 - Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the engine 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 - 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 prevent the engine from starting. 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 - 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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Frequently Asked Questions
Why does my small engine start but die after a few seconds?
Can a clogged fuel cap cause an engine to run and then die?
What should I check when my lawn mower or snowblower starts but will not stay running?
How do I find the correct replacement carburetor or fuel cap for my small engine?
When should I test the ignition system or call a small engine technician?