What The Color Of The Exhaust From Your Backup Generator Mean | Marion, SC

What The Color Of The Exhaust From Your Backup Generator Mean | Marion, SC

When the power goes out, your backup generator can be a lifesaver. But have you ever noticed the color of the exhaust coming from your generator and wondered what it might mean? Here’s a quick guide to help you understand what the color of your exhaust might be trying to tell you.

Excessively White Exhaust

If you’ve ever noticed white exhaust billowing from your backup generator, the following could be the cause:

Water in the Fuel

One of the most common causes of the white exhaust is water in the fuel. When water gets into your fuel tank, it can cause your engine to run less efficiently. Not only will this cause your exhaust to be whiter than usual, but it can also lead to a loss of power and decreased fuel economy. If you suspect that water may be the problem, there are a few things you can do. First, check your fuel tank for any signs of leakage. Second, Drain your tank and refill it with fresh fuel. And finally, have a backup generator professional in Marion, SC check your fuel system for leaks or damage.


Another common cause of white exhaust from a backup generator is overheating. If your engine runs too hot, it can cause the coolant to boil and turn into steam. This steam will then be expelled through the exhaust system, causing it to appear white. To fix this problem, you’ll need to find the source of the overheating and address it accordingly. It could be a faulty thermostat or low coolant levels.

Faulty Oxygen Sensor

A faulty oxygen sensor can cause your backup generator to blow white exhaust fumes. When an oxygen sensor malfunctions, it causes the air-fuel mixture in the combustion chamber to become unbalanced. This can lead to several problems, including white exhaust, decreased fuel economy, and increased emissions. To fix this problem, you’ll need to have the oxygen sensor professionally repaired or replaced.

Incorrect Fuel Mix

If you’re using a 2-stroke generator, you’ll need to mix the proper ratio of gas and oil before adding it to your fuel tank. If this ratio isn’t correct, it can cause all sorts of problems, one of which is white exhaust. An incorrect fuel mix can cause piston rings to wear out prematurely, allowing excess oil to enter the combustion chamber. This oil will then get burned along with the gasoline, leading to high levels of smoke and soot in the exhaust. Mix the fuel correctly according to your generator’s specifications to fix this problem.

Worn Out Engine Parts

Finally, another common cause of white exhaust from generators is worn-out engine parts. Over time, as engine parts wear out, they can become less efficient and cause the engine to run less smoothly, producing white exhaust. To fix this problem, you’ll need to have the worn-out parts replaced by a qualified generator professional in Marion, SC.

Dark Gray or Black Exhaust

If you’ve noticed that your backup generator’s exhaust has been turning a dark gray or black color, the following could be the cause:

Faulty Injectors

When the injectors are not working properly, they do not deliver the correct fuel to the engine. As a result, the engine will run lean, causing it to produce more soot hence the black exhaust. In addition, the engine will run hotter than normal, which can lead to pre-ignition and knock. If you notice any of these symptoms, it is important to have the injectors checked as soon as possible. Left unchecked, faulty injectors can cause serious damage to the engine. So if you suspect that your injectors may be faulty, it’s important to have them checked out by a professional.

Dirty Oil

If the oil in your generator is dirty, it can cause the exhaust to be dark gray or black. The oil can become dirty if it’s not changed regularly or if it hasn’t been properly filtered. Dirty oil can also be caused by using the wrong oil or operating the backup generator in dusty or dirty conditions. When the oil gets dirty, it doesn’t lubricate the engine as well, causing the engine to run hotter than normal.

The heat can cause the fuel to ignite prematurely, which can damage the engine and cause the exhaust to be darker than normal. If you notice that your generator’s exhaust is darker than usual, it’s important to have the generator serviced so that the oil can be changed and the filter can be checked. Depending on the severity of the problem, you may also need to have the engine repaired or replaced.

Clogged Air Filter

A dirty or clogged air filter can also cause your generator’s exhaust to appear black. The air filter is responsible for keeping dirt and dust out of the engine; over time, it can become clogged with debris. This can restrict airflow to the engine, causing the exhaust to turn darker in color. If you suspect your air filter is to blame, check it and clean it if necessary. You should also have your generator regularly serviced to ensure that all of its parts are in good working order. By taking these steps, you can help keep your backup generator running smoothly and prevent exhaust problems in the future.

Don’t Ignore Exhaust Problems

If you’ve noticed that your generator’s exhaust is darker or white than usual, it’s important to have it checked out by a professional in Marion, SC as soon as possible. Ignoring the problem can cause serious damage to the engine and can also be dangerous for you and your family.

We Are the Professionals to Call

If you notice anything out of the ordinary with your backup generator’s exhaust, don’t hesitate to call us at Mister Sparky Generators. Our team of experienced technicians will be able to diagnose the problem and get your generator running smoothly again in no time. Don’t hesitate to give us a call today.

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