How to fix a generator that starts and then dies

Nothing’s more annoying than depending on your generator during a power outage or camping trip, only to have it start up and then quit on you moments later. If you’ve been trying to figure out why this keeps happening, you’re in the right spot. We’ll go over some common reasons your generator won’t keep running and how you can fix it yourself.

Keep in mind, this info might not match your generator exactly. We aim to help with all sorts of DIY generator fixes, but different models can have unique steps and parts. For the best advice, it’s a good idea to check your generator’s manual or reach out to us if you’ve got questions.

Common causes and DIY fixes

1. Generator is overloaded

Plugging in too many devices can overload your generator, making it shut down to protect itself.

1. Unplug devices you don’t need to lower the load.
2. Make sure the total wattage of everything connected stays below the generator’s capacity.
3. It might help to figure out how much power your stuff needs in advance.

2. Fuel level is low

Generators need enough fuel to keep going. Running on fumes won’t cut it.

1. Look at the fuel gauge and top off the tank with the right kind of fuel.
2. Use fresh fuel to avoid problems from old or bad gas.
3. If refueling all the time is a pain, maybe consider generators that run on natural gas or propane for longer use.

3. Oil level is low

Generators often have a low-oil sensor that shuts off the engine to prevent damage.

1. Use the dipstick to see where the oil level is at.
2. If it’s low, add the kind of oil recommended for your generator.
3. If the oil looks dirty or nasty, change it to keep your generator in good shape.

4. Fuel lines are clogged or damaged

Clogged or damaged fuel lines can stop fuel from getting to the engine.

1. Check the fuel lines for cracks, leaks, or other damage.
2. If there’s a blockage, carefully clean the fuel lines.
3. Swap out any damaged fuel lines with ones that fit your generator.
4. Make sure all the connections are tight to stop any leaks.

5. Carburetor has problems

Over time, gunk can build up in the carburetor, messing with the fuel mix.

1. Take off the carburetor using the steps in your generator’s manual.
2. Clean all the parts with carburetor cleaner to get rid of any gunk.
3. Put the carburetor back together and reinstall it carefully.
4. Cleaning it regularly can help avoid problems down the road.

6. Spark plugs are dirty or faulty

Dirty or faulty spark plugs can stop the engine from running smoothly.

1. Find the spark plug and take it out with a spark plug socket.
2. Look for any damage or buildup.
3. If it’s dirty, clean it with a wire brush.
4. If it’s damaged or really worn out, replace it with a new one.
5. Double-check the spark plug gap matches what the manufacturer says.

7. Air filter is clogged

A clogged air filter can cut off airflow, causing the engine to stall.

1. Take off the air filter cover to get to the filter.
2. Check the filter for dirt, dust, or debris.
3. If it’s washable, clean it with soap and water, and let it dry completely.
4. If you can’t wash it or it’s really dirty, replace it with a new one.
5. Regularly checking and cleaning the air filter helps keep things running smoothly.

8. Battery is low or dead

For generators with electric start, a low or dead battery can cause shutdowns.

1. Check the battery voltage with a multimeter.
2. If it’s low, charge the battery with an external charger.
3. Look at the battery terminals for corrosion and clean them if needed.
4. Make sure the generator’s charging system is working right.

Note: A multimeter is a gizmo that measures things like voltage and resistance. If you’ve never used one before, our guide on testing appliance parts can help you get started.

9. Choke valve is not set correctly

The choke controls the air-fuel mix during startup. If it’s not set right, the engine can die.

1. Make sure the choke is fully closed when starting a cold engine.
2. Gradually open the choke as the engine warms up.
3. If the engine’s already warm, start it with the choke open.
4. Check your generator’s manual for details on how to use the choke.

10. Exhaust system is blocked

A blocked exhaust can make the engine stall because of increased backpressure.

1. Look at the exhaust muffler and spark arrestor for soot or debris buildup.
2. Carefully clean the spark arrestor screen.
3. Get rid of any blockages from the exhaust outlet.
4. Replace any damaged exhaust parts if needed.

11. Fuel pressure is incorrect

Pressure buildup in the fuel tank can mess with fuel flow.

1. Check the vent on the fuel tank cap to make sure it’s not clogged.
2. Let out any extra pressure by loosening the fuel cap, then tighten it again.
3. If the vent isn’t working right, you might need to replace the fuel cap.
4. Regular maintenance can help avoid pressure problems.

12. Sensors are failing

Bad sensors can send wrong signals, causing the generator to shut down.

1. Look for error codes or warning lights on the control panel.
2. Use the manual to find and understand the sensors.
3. Replace any bad sensors.
4. You might need to reset or reprogram the generator after replacing sensors.

Wrapping up 

Remember, knowing your generator’s exact model is super important. If you’re not sure about any steps or need parts, give us a shout for repair help.

For more tips and resources, visit AppliancePartsPros.com. We’re here to help you with all your appliance part needs and DIY repair guidance.

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If you’ve got any questions or need more help, don’t hesitate to reach out. We’re here to lend a hand!