CRAFTSMAN M100 RUNS FOR A SECOND THEN DIES General Troubleshooting
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91%
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Carburetor Assembly
The most common cause for an engine starting and immediately dying is a clogged main jet within the carburetor. Ethanol-blended fuel leaves varnish deposits that restrict fuel flow, allowing the engine to fire on the primer fuel but starving it of the continuous flow needed to remain running. Replacing the assembly is the standard resolution for modern small engines with non-serviceable internal passages.
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CHECK PRICE |
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5%
CONF
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Vented Fuel Cap
Small engine fuel systems rely on a vented gas cap to allow air into the tank as fuel is drawn out. If the vent is obstructed by debris or corrosion, a vacuum forms inside the tank, physically preventing fuel from reaching the carburetor. This leads to immediate stalling as the engine cannot overcome the negative pressure.
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CHECK PRICE |
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4%
CONF
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Spark Plug
A fouled or 'bridged' spark plug may have enough conductivity to spark during the high-voltage surge of a pull-start but fails to maintain a consistent arc once the engine reaches operating RPM. Carbon buildup on the electrode can cause the engine to stumble and die almost immediately after the initial ignition sequence.
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DIY Repair Guide
Watch exactly how to replace the Carburetor Assembly.