6 Ways On How to Reduce Generator Fuel Consumption

In today’s world, power outages are frequent and widespread. While many are brief, others can last for hours. This can cause businesses to lose customers and incur significant expenses for having their merchandise or processes sit idle. In some cases, it may even threaten a company’s entire business model.

For this reason, it makes sense for homes and companies to have backup generators on hand in case of an emergency. Yet, too often, business owners find themselves spending money on generators but neglecting one crucial element: fuel efficiency.

Though generators do not require nearly as much fuel as they once did, they still consume a great deal each day. Fortunately, there are several ways to reduce generator fuel consumption, some of which are physical modifications while others are operational.

So, here are six different approaches that will help you reduce your fuel consumption by 20% or more.

6 Methods On How To Reduce Generator Fuel Consumption

1. Maintain Proper Oil Levels

Running a generator with low oil can result in severe damage and costly repairs, as well as a reduction in power output capability. In addition, generators burn fuel more efficiently when working at optimal efficiency. The result is fewer trips to the gas station.

Consult an owner’s manual to determine exactly how much oil you need to keep your oil levels in check. In most circumstances, adding a small amount at a time is preferable to overfilling and having unused fuel in your tank.

Also, keep in mind that generators may come with different types of oil. So, if you have more than one unit, check the manual to find which type you use.

2. Match Load Size to Engine Power

Matching your generator’s engine power to load size ensures you don’t overload it. It results in high fuel consumption and fewer hours of use between refueling when strained.

Fortunately, a generator’s voltage regulator, either manual or automatic, allows you to match load size to engine output. This is critical when using large home appliances like refrigerators and freezers and when using your generator to power other appliances.

As a result, double-check that each appliance is compatible with your generator. If it requires more energy than your generator can provide, you risk overloading it, resulting in higher pump costs and shorter refill intervals.

3. Switch off Unnecessary Appliances

How to Reduce Generator Fuel ConsumptionDuring regular hours, your home will be powered by utility companies. However, generators serve as backup energy sources to ensure essential services are operating normally.

During an outage unplugging all unnecessary appliances is an easy way to save fuel. For instance, keep lights off and ensure that significant appliances like refrigerators and freezers are not plugged into the generator unless necessary.

Also, consider adding power management devices or smart outlets to your generator. These will allow you to shut off certain electronics to extend your generator run time and keep your home safe during outages.

4. Get Rid of Carbon Deposits

How to Reduce Generator Fuel ConsumptionCarbon deposits (also known as carbon buildup) are one of the generators’ most prominent foes. Not only can they hurt performance, but they reduce engine lifespan and decrease efficiency.

A straightforward way to avoid carbon buildup is to clean your engine with an automatic fuel injector cleaner regularly. Also, check your owner’s manual for recommendations on how often to change out filters. Both of these techniques will lower fuel consumption and emissions dramatically.

5. Change Spark Plugs Regularly

How to Reduce Generator Fuel ConsumptionA generator’s efficiency depends on its spark plugs. They can, however, lose their potency over time as a result of carbon deposits. If you discover that your generator uses more fuel than usual and produces less electricity, it’s time to replace the spark plugs.

New spark plugs will help you save money on expensive liquid fuels by improving the overall efficiency of your generator. The EPA recommends replacing spark plugs every 100 hours.

You can find a replacement at any auto-parts store or big-box retailer. Before replacing your plug, double-check to ensure that it matches the brand and model of your generator.

6. Turn it Off When Not in Use

How to Reduce Generator Fuel ConsumptionLeaving your generator running wastes fuel and puts unnecessary wear and tear on the engine. Sure, this might take several hours for your generator to warm up each time you use it, but it’s a lot easier than restarting an engine that’s been sitting in a cold garage all day.

For example, if you live in a region where power outages frequently occur, only use your generator during extended power outages. Or, at the least, make sure it’s entirely switched off after the power is restored. This alone could save you up to 15% in fuel costs.

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Frequently Asked Questions about Generator Fuel Consumption

Does a generator consume less fuel if less power is used?

Fuel consumption is not directly related to how much power you use. If you don’t use your generator’s power, it will still use fuel while operating on its internal combustion engine.

How much fuel does a generator use per hour?

On average, a five-gallon gasoline generator consumes around 0.75 gallons of fuel per hour. This varies depending on the model and how it’s being used. For instance, if you’re running multiple appliances at once, your generator will use more fuel than if it were only powering one.

Does a generator use more gas if you use more electricity?

Yes, absolutely. The more electricity you consume, the more gas the generator uses. As a rule of thumb, if you double your electrical load on a generator while it’s running, you’ll increase fuel consumption.

How do generators save oil?

Generators produce power by burning fuel. When a generator consumes fuel slower than it generates electricity, it effectively conserves oil. Consequently, the less fuel your generator consumes, the more oil you save.

Why is my generator consuming too much oil?

When a generator is under heavy loads, it consumes more fuel and oil. The added friction causes additional wear on moving parts, including seals, bearings, and gaskets. This can also lead to higher oil usage at idling speeds.

Why is my fuel consumption so high?

A variety of reasons can lead to your generator consuming a lot of fuel. Some are easy to fix, while others may necessitate the services of a certified mechanic. However, clogged filters, low oil levels, and excess carbon buildup are the most common causes of high fuel consumption.

How long does fuel last in a generator?

The life of your generator’s fuel tank depends on several factors—the size of the generator, type of fuel, and the workload. For example, a smaller capacity tank will drain faster than a larger one, while a propane-powered generator will be more efficient than those that run on diesel or gasoline.

Environmental conditions also play a role: it takes more fuel to power a generator in freezing temperatures than it does at 70 degrees.

How many liters of fuel does a generator use?

The amount of fuel a generator uses depends on several factors, including load (how much electricity it’s producing), type of fuel, and temperature. For instance, for every kilowatt-hour (kWh) of energy generated, a diesel generator uses about 0.27-0.32 liters of fuel.

What is the most fuel-efficient generator?

Diesel generators are generally more fuel-efficient than gas generators. A diesel generator uses a fraction of its energy to power itself, which means delivering a higher percentage of its capacity for a lower fuel input.

Can I mix new gas with old gas?

Yes, you can repurpose old gasoline by diluting it with a large amount of fresh gasoline. However, if it contains corrosion, dirt, or discoloration, don’t mix it.

What happens if a generator is overloaded?

When a generator is overloaded, it may exceed its rated load and trip the internal circuit breaker. As a result, it will automatically shut off fuel delivery to prevent damage to itself and nearby equipment. A well-designed generator will also have an overload protection feature that protects itself and connected electrical equipment from damage.

Should I store my generator with gas?

No, never keep fuel in your generator. This is because it can lead to moisture building up in your fuel tank, which can cause rust. Additionally, storing a generator with gas inside a non-ventilated space could lead to an explosion. You can, however, purchase a fuel stabilizer to keep your fuel fresh until the next time you use it.


Final Thoughts

When it comes to reducing generator fuel consumption, every step counts. When you’re not using it, please turn off your generator, change your oil regularly, and stay on top of maintenance like spark plug changes and belt replacements.

You might also want to consider upgrading your equipment, such as converting from a diesel or gasoline engine to one that operates on natural gas or propane.

Either way, taking steps towards making better use of our generator’s fuel efficiency can translate into more money in your pocket during a utility outage.

About Steve Stuart

Steve Stuart is an electrical engineer who developed interest on generators during his school years. After school, he became a generator enthusiast. This is after encountering power supply problems at the area of residence where he lived. Power would be on and off and so food would go bad and the room heater would go off especially during winter. After trying the different generator brands for several years, Steve now provides information on the available brands and products in the market today. Based on his experience, he gives the do’s and the don’ts when it comes to generator use.

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