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String Trimmer Engine Stops After a Few Seconds

The string trimmer small engine often has a separate model number. Use the small engine model number for a complete list of symptoms and parts. Watch our model # lookup video for help finding the model number.

The 6 most common part(s) or condition(s) which contribute to the symptom String trimmer engine stops after a few seconds are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.


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For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.

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Spark Arrester

Inside the muffler of string trimmer engine is a screen-like device called a spark arrestor. If the string trimmer runs poorly or engine stops after a few seconds, the spark arrestor might be clogged. The spark arrestor prevents small embers from being emitted by the engine to prevent fires. Over time the spark arrestor will become clogged with soot. Remove the spark arrestor and clean with a wire brush or replace.

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Carburetor

If the string trimmer engine stops after a few seconds, the carburetor might be clogged or have bad fuel in the float bowl. If old fuel was left in the string trimmer for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the small jets and ports in the carburetor and it can be difficult to burn allowing the engine to only run for a few seconds. The only solution is to drain the old fuel from the float bowl and thoroughly clean the carburetor with carburetor cleaner. If that isn't effective, replace the entire carburetor.

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Carburetor Kit

If the string trimmer engine stops after a few seconds, the carburetor might be clogged or have bad fuel in the float bowl. If old fuel was left in the string trimmer for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the small jets and ports in the carburetor assembly and it can be difficult to burn making the string trimmer engine run roughly. The only solution is to drain the old fuel from the float bowl and thoroughly clean the carburetor assembly with carburetor assembly cleaner. If that isn't effective, rebuild the carburetor with this carburetor kit.

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Gas Cap

If the string trimmer engine stops after a few seconds, the gas cap might be defective. All gas caps have a small vent to allow air back into the tank when the string trimmer engine is running - otherwise as gas is drawn from the tank it would create a vacuum. The vent can be difficult to see and there are many different types of vent. If YOU find that loosening the gas cap a little allows the engine to stay running, YOU should replace the gas cap. It's sometimes possible to clean the vent, but on most newer engines the vent cannot be cleaned, YOU have to replace the cap.

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Fuel Filter

If the string trimmer engine stops after a few seconds, the fuel filter might be clogged. If old fuel was left in the string trimmer for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the fuel filter and it can be difficult to burn allowing the engine to only run for a few seconds. The only solution is to drain the old fuel from the fuel tank and replace the fuel filter.

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Air Filter

If the string trimmer engine stops after a few seconds the air filter might be clogged. Remove the air filter and replace with the correct filter.

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