Why your generator won’t start after sitting idle and how to fix it

So you’ve dragged out your generator after it’s been sitting around for months, expecting it to start right up. But instead, nothing happens. Frustrating, right? Especially when you really need that power. Let’s talk about why this happens and how you can get your generator back up and running.

This info might not match your exact generator model. We aim to share helpful DIY tips, but different models and setups mean some steps, error codes, or parts might differ. For the best guidance, check your manufacturer’s manual or reach out to us if you’ve got questions.

Why doesn’t my generator start after sitting?

• Old gas: Gasoline can go bad over time. If your generator’s been holding the same gas for a couple of months or more, it might cause clogs and make starting tough. Old fuel can gum up the carburetor and fuel lines, stopping the gas from flowing properly.
• Low fuel: It might sound obvious, but sometimes the tank is just low or empty. Plus, the fuel valve might be turned off, keeping fuel from reaching the engine.
• Choke position: The choke adjusts the air-to-fuel mix when starting up. For a cold engine, the choke should be “closed” to enrich the fuel mixture.
• Dirty air filter: A clogged air filter can block airflow to the engine, messing with combustion.
• Bad or dirty spark plug: The spark plug ignites the fuel-air mix in the engine. If it’s dirty, worn out, or faulty, your engine might not start.
• Low oil: Generators often have low-oil sensors that stop the engine if the oil’s too low, to prevent damage.
• Faulty oil sensor: Sometimes, the oil sensor might malfunction, wrongly indicating low oil and stopping the generator from starting.
• Gummed-up carburetor: Old fuel can leave behind deposits that clog the carburetor, blocking fuel from getting to the engine.
• Dead battery: If your generator has an electric start, a dead battery can stop it from starting.

How to get your generator running after it sits idle

Step 1: Check fuel and choke

Make sure the fuel valve is on and there’s enough fresh gas in the tank. Set the choke to “closed” or “start” for a cold engine. These basic settings are vital for getting the generator started.

Step 2: Check the oil

Generators can shut down if the oil’s too low. Check the oil level with the dipstick. If it’s low, add the right type of oil until it’s at the proper level. Keeping an eye on the oil can prevent starting issues.

Step 3: Look at the air filter

Pop off the air filter cover and take out the filter. If it’s dirty, clean it following the manufacturer’s instructions or replace it. A clean air filter ensures the engine gets enough air to combust the fuel.

Step 4: Check the spark plug

Remove the spark plug with the right socket wrench. Look for wear, deposits, or damage. Clean it with a wire brush if needed, or replace it if it’s beat up. To see if it’s sparking:

1. Reconnect the spark plug wire.
2. Hold the threaded part against the metal part of the engine to ground it.
3. Have someone pull the starter cord while you watch for a blue spark at the gap.
4. If there’s no spark, the spark plug might be bad, or there could be an issue with the ignition coil.

Step 5: Drain and replace the gas

Old gas can be a problem. To drain it:

1. Turn off the fuel shutoff valve.
2. Put a container under the carburetor drain bolt.
3. Loosen the bolt to let the fuel flow out.
4. Tighten the bolt after draining and dispose of the old gas properly.
5. Fill up with fresh gasoline. A fuel stabilizer can help keep gas fresh during storage.

Step 6: Clean the carburetor

If draining the gas didn’t help, you might need to clean the carburetor:

1. Turn off the fuel valve and remove the carburetor bowl by unscrewing the bolt at the bottom.
2. Carefully remove any gaskets without tearing them.
3. Spray carburetor cleaner into the bowl and jets to clear out deposits.
4. Use compressed air to blow out any leftover debris.
5. Put the carburetor back together, making sure everything’s snug.

Wrapping up

Need more help with your generator or other appliances? Check out our repair help section for guides and resources.

At AppliancePartsPros.com, we’re here to support your DIY repair journey. For quality parts and expert advice, we’re just a click away.

Don’t forget to follow us on social media for tips, updates, and exclusive offers. We’re on Facebook and Twitter.

If you’ve got questions or need a hand, don’t hesitate to reach out. We’re here to help you keep your appliances running smoothly.