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HomeRepair HelpBriggs & Stratton RepairBriggs & Stratton Small engine stops after a few seconds Repair

Briggs & Stratton Small engine stops after a few seconds

When a Briggs & Stratton lawn mower engine runs for a few seconds then dies, a clogged carburetor is the most likely cause. Stale or ethanol-blended fuel left in the carburetor during storage can evaporate and leave a sticky residue that blocks fuel passages, causing the engine to start but not stay running. Clean the carburetor with carburetor cleaner, then rebuild it with a Briggs & Stratton small engine carburetor repair kit or replace the carburetor if cleaning does not restore proper fuel flow. If the carburetor is clean, check the fuel cap. A clogged fuel cap vent can create a vacuum in the fuel tank, restricting fuel to the carburetor and making the lawn mower engine stall after starting. Loosen the fuel 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, or engine starts but won't stay running. Enter your model number to find the exact carburetor, repair kit, or fuel cap replacement part for your specific Briggs & Stratton engine.

01 - Briggs & Stratton 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 - Briggs & Stratton 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 - Briggs & Stratton 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 Briggs & Stratton engine start and then die after a few seconds?
Can a clogged fuel cap cause a lawn mower engine to run and then die?
What should I check first when my Briggs & Stratton engine stalls after starting?
How do I know which Briggs & Stratton part fits my small engine?
What if cleaning the carburetor does not stop the engine from dying?