Stop
Never run a generator indoors, in a garage, or near open windows; carbon monoxide buildup can be fatal within minutes.
Symptoms
- Pull cord or electric start does nothing
- Engine turns over but doesn't fire
- Started fine last season, won't start now
- Fuel valve or choke set incorrectly
Likely causes
- CommonLow oil triggering the automatic shutoffMost generators won't start if oil is below the minimum level.
- CommonStale fuelOld gas breaks down and clogs the carburetor.
- CommonFouled spark plugCarbon buildup prevents reliable spark.
- PossibleFuel valve closed or choke misadjustedSimple switch positions are often overlooked.
- PossibleDead battery on electric-start modelsBatteries discharge during storage.
What to do
- Check the oil level first since low oil blocks starting on most models.
- Open the fuel valve and set the choke according to engine temperature.
- Drain stale fuel and refill with fresh gasoline if it's been stored for months.
- Pull the spark plug and check for fouling; clean or replace it.
- For electric-start models, check or charge the battery.
- Check the air filter and clean or replace if dirty.
- If it still won't start, the carburetor may need professional cleaning.
Tools and parts
- Spark plug socket
- Fresh gasoline
- Engine oil
Generator engine oilSearch: “small engine oil for generator”
Spark plugSearch: “portable generator spark plug”
When to call a pro
A small-engine shop can service the carburetor or test the ignition if basic maintenance doesn't get it running.
Safety
Stop
Never run a generator indoors, in a garage, or near open windows; carbon monoxide buildup can be fatal within minutes.