Is It Bad To Run A Generator Out Of Gas?

Oil or gas is to an engine just like food is to humans. We can’t live or work without food, same is with generators. When there is no sufficient supply of gas, they cannot work properly.

Is It Bad To Run A Generator Out Of Gas?

Running a generator with insufficient gas will put a load on the engine, ultimately leading to a malfunctioned generator. It is necessary to check the gas level of your generator every time you use it. If the gas level is much lower than the required range, never run your machine. This will cause the coils of the generator to lose their magnetism.

What Happens When A Generator Runs on Low Gas?

When using a  portable gasoline generator, you’re less likely to run into issues when the fuel supply is low. This is because these generators rely on gravity to get fuel from the tank to the engine, which operates the alternator’s rotor.

However, if the generator is operated on low fuel regularly, it can lose residual magnetism over time. Larger diesel generators may lose magnetism and will need to be re-magnetized if this occurs.

Fuel pumps require the fuel from the gas tank to cool themselves, and if the gas tank is low or nearly empty, the gas is replaced with air, causing the pump to overheat.

However, as the fuel runs out, the generator finally shuts down. This does not cause immediate harm to the fuel pump, but it can affect the generator’s lifespan over time.

In addition, if the pump is drawing air into the engine, the engine will need to be primed after refueling, which can be a difficult task.

Is It Possible To Put Gas In A Generator That Has Already Been Running?

Is It Bad To Run A Generator Out Of Gas?

When a generator is turned on, it can become fairly hot. Spilled gasoline might ignite or even explode due to the extreme heat.

It’s not a good idea to put gasoline in a generator that’s already operating. It is recommended that you wait till 15 minutes before adding gas to your generator.

Naturally, you want to start using the generator as soon as possible. The hazards, on the other hand, aren’t worth it.

How To Drain Gas from Your Generator?

Maintenance of a generator is very important when you are using it regularly. It is important to prevent any problem and to increase the lifespan of the generator. For this purpose, it is important to drain out stale fuel or gas from the generator.

Fresh, stable gas should always be available for your generator. If your generator doesn’t have a drain, empty the tank first, then run it until the gas finishes. If your unit has a drain, make sure the engine is completely cool before draining it.

If you aren’t planning to use your generator for some time or are storing it for the summer, the best time to drain the gas out of it is after an extended period without use.

What Is The Process Of Draining The Gas From Your Generator?

As mentioned above, draining gas from the generator is very essential for efficient working. The stale gas can cause serious harm to your generator.

Follow the steps given below to drain gas from the generator:

  • Place the generator in a well-ventilated environment.
  • Allow ventilation throughout the gas tank by opening the gas tank cap.
  • Make sure you can reach the gasoline lines easily. Remove any plastic covers that may be present.
  • When you remove one side of the line, turn the fuel valve off so the valve is closed.
  • Pinch the gasoline line that does not attach to the gas tank and remove the clip. Remove the tubing from the fuel valve afterward.
  • Place a bowl or other container next to the device and put the fuel valve tube into the container. Tilt the generator to one side so that all the fuel escapes through the fuel line that isn’t connected to the gas tank.
  • To drain the remaining gasoline from the generator, turn the fuel valve to On.
  • Reconnect the fuel line, close the fuel tank lid, and replace the cover.
  • Using your generator’s guide, locate the carburetor and remove the bolt. Allow any residual gas to escape into the container.
  • Replace the bolt on the carburetor using pliers.

Related Questions

How long can a generator run indefinitely?

Natural gas generators are connected to the natural gas lines of a residence. Thus they can theoretically run continuously. Most generator manufacturers, on the other hand, advocate running a generator for no more than 500 hours at a time, or little under 21 days.

How Long Can You Leave Gas in a Generator?

You can store gasoline in your generator for up to six months. This is the maximum amount of time you should leave gas in the generator. You could use a fuel additive if you want to retain the gas in the generator for longer than 6 months. Then you’ll be able to use this fuel for over a year.


Till now, you are familiar with the fact that it is hazardous to run a generator on low gas. Make sure to fill the gas and replace it when needed. Keep a maintenance check on fueling your generator and don’t forget to drain stale gas from the generator.

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