Generator won't start

Symptoms

• Pull cord is hard to pull or engine won't fire
• Electric start does nothing or clicks
• Engine turns over but doesn't catch
• Backfires without starting

Likely causes

• CommonOld or stale gasolineFuel left in the tank or carburetor for over a month can degrade and gum up small passages.
• CommonFuel valve closed or choke set wrongMost generators need the fuel valve open and the choke closed (for cold starts) to start properly.
• CommonFouled spark plugCarbon buildup, especially after storage, prevents a strong spark.
• PossibleDead battery (electric start models)Batteries self-discharge in storage and can be too weak to crank the engine.
• PossibleCircuit breaker or low-oil shutoff engagedMany generators won't start if oil is low or if an internal breaker has tripped.

What to do

1. Check the fuel valve is open, the choke is set for a cold start, and there's fresh, adequate fuel in the tank.
2. Check the oil level; most modern generators have a low-oil sensor that prevents starting when oil is low.
3. Inspect and reset any circuit breakers on the generator's control panel.
4. Remove the spark plug, check for fouling or wear, clean or replace it, and confirm you get a visible spark when grounded against the engine (with the plug wire off the fuel line).
5. On electric-start models, check the battery's charge, and try the pull cord as backup if equipped.
6. If fuel is more than a month old, drain it and refill with fresh gasoline; add stabilizer for future storage.
7. If it still won't start with fresh fuel, good spark, and adequate oil, the carburetor likely needs cleaning, which is worth taking to a small-engine shop.

Tools and parts

• Spark plug socket or wrench
• Fresh gasoline

When to call a pro

If fuel, spark, and oil all check out and it still won't start, a small-engine repair shop can clean or rebuild the carburetor.

Safety