Symptoms
- Pull cord resists or produces no start
- Engine turns but doesn't fire
- Strong gas smell suggesting a flood
- Sat unused for a long period
Likely causes
- CommonStale fuelOld gasoline degrades and clogs the carburetor.
- CommonFouled spark plugCarbon deposits prevent reliable spark.
- CommonDirty air filterRestricted airflow prevents proper combustion.
- PossibleLow or contaminated engine oil triggering low-oil shutoffMany splitter engines have a sensor that blocks starting when oil is low.
- PossibleClogged carburetorVarnish from old fuel can block small carburetor passages.
What to do
- Check the engine oil level first; many models won't start if oil is low.
- Drain stale fuel and refill with fresh gasoline.
- Pull and inspect the spark plug for fouling; clean or replace it.
- Check and clean or replace the air filter.
- Verify the fuel shutoff valve is open and the fuel line is clear.
- Try starting with the choke set according to engine temperature.
- If it still won't start, the carburetor may need professional cleaning.
Tools and parts
- Spark plug socket
- Fresh gasoline
- Engine oil
Small engine spark plugSearch: “log splitter spark plug”
Engine oilSearch: “small engine oil SAE 30”
When to call a pro
A small-engine shop can service the carburetor or diagnose a faulty low-oil sensor.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.