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HomeRepair HelpMTD Small Engine RepairMTD Small engine stops after a few seconds Repair
MTD Small engine stops after a few seconds
If your MTD small engine starts but won't stay running, the carburetor is the most likely cause. Stale or ethanol-blended fuel left in the carburetor, especially during seasonal storage, can evaporate and leave a sticky residue that clogs the carburetor and restricts fuel flow. This causes the engine to run for a few seconds, then die, or creates an engine starts then dies symptom. Clean the carburetor with carburetor cleaner first. If cleaning does not solve the problem, the carburetor may need a carburetor repair kit or complete replacement. A clogged passage, needle valve, or main jet can prevent the engine from getting the fuel it needs to keep running. The next likely cause is a clogged fuel cap vent. Loosen the fuel cap slightly and restart the engine. If it stays running, the blocked vent is creating a vacuum in the fuel tank, and the fuel cap should be replaced. Whether your MTD engine runs then dies or stalls after starting, enter your model number to find the exact carburetor, repair kit, or fuel cap replacement part for your specific engine.
01 - MTD Small Engine 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 - MTD Small Engine 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 - MTD Small Engine 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 MTD small engine start but then die?
Can a clogged fuel cap cause an MTD engine to run for a few seconds then die?
Should I replace the MTD carburetor or try a repair kit first?
How do I find the correct MTD small engine carburetor or fuel cap?
What should I check safely before repairing an MTD engine that dies after starting?
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