Onan Generator Won T Stay Running

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🔥Is your Onan generator not staying running? This can be a frustrating experience, especially if you rely on your generator for power in emergency situations or for your business. However, there are a variety of potential reasons why your Onan generator won’t stay running, and with some troubleshooting, you may be able to pinpoint and fix the issue. In this article, we will explore the common causes of Onan generator problems and provide tips for fixing them.

Hello MonsterWoodshop readers!

👋Welcome to our guide on fixing your Onan generator. As a generator repair specialist, we understand the frustration that can come with a generator that won’t stay running. Whether your generator is brand new or has been in use for years, we hope that the information in this article will be helpful in resolving any issues you’re experiencing. From fuel issues to electrical problems, we’ll cover it all! So, let’s get started.


🚀Onan generators are popular because of their durability and reliability. They’re commonly used in businesses, RVs, and even outdoor events. However, no matter how well-maintained your generator may be, it can still run into problems. The most common issue with Onan generators is that they won’t stay running.

🚀There are several reasons why your generator may be shutting down, such as issues with fuel delivery, a malfunctioning carburettor or air filter, or even a problem with the spark plugs. To determine the issue, you will need to conduct a series of tests to narrow down the potential causes. In this article, we will guide you through the troubleshooting process and provide tips on how to fix your Onan generator.

Common Causes of Onan Generator Problems

👷‍♂️Before we dive into the specific troubleshooting steps, let’s first explore some of the most common causes of Onan generator problems and why they might cause your generator to shut down.

Lack of Fuel

🔋One of the most common reasons why a generator won’t stay running is because of a lack of fuel. If your generator has an insufficient amount of fuel, it won’t be able to generate enough power to keep the engine running. Additionally, if you have stale fuel in your tank, this can prevent your generator from starting or staying on.

Dirty Fuel Filters

🧹Fuel filters prevent contaminants from entering your generator. Over time, these filters can become clogged with particles and debris, making it difficult for fuel to flow freely to the generator. If the fuel filter is clogged, that can cause the generator to shut down.

Bad Spark Plugs

🔌Spark plugs are essential for starting and continuing to run your generator. If there is a problem with the spark plug, such as if it is fouled or has a loose connection, the generator won’t be able to start or stay on. You need to make sure that your spark plugs are clean and functioning properly to prevent generator problems.

Low Oil Pressure

🚨Generators require oil to operate smoothly. If there is low oil pressure, the generator will shut down to prevent damage to the engine. This can be caused by either a lack of oil, inadequate lubrication of the engine components, or a malfunctioning oil pressure switch.

Strengths and Weaknesses of Onan Generators


🌟Onan generators are known for their durability and longevity. They are made with high-quality materials and designed to withstand heavy use and extreme conditions. Additionally, they are typically more fuel-efficient than other generator brands, meaning they save you money in the long run.

🌟In case of emergencies, Onan generators make sure that you are not powerless. A power outage can cause a disruption of vital medical equipment for people on life support. Having a reliable generator can save lives and provide peace of mind.


👎Onan generators, like most generators, require proper maintenance to function at their best. A neglected generator is more likely to experience problems such as clogged fuel lines or malfunctioning spark plugs. Maintaining your generator can be expensive if you outsource it.

👎In addition, Onan generators tend to be more expensive than other brands. Although they are known for their quality, purchasing an Onan generator requires an investment. This can be a drawback for customers seeking cheaper options.

Onan Generator Information Table

Generator Model Engine Model Wattage Rated Output Dimensions
Onan 5.5 HGJAB-1038 OHV Gas 5500 45.8 amps, 120/240 volts, single phase 33.6 x 22.2 x 14.4 inches
Onan 7.5 HDKAT-41934 OHV Gas 7500 62.5 amps, 120/240 volts, single phase 34.9 x 22.2 x 14.4 inches
Onan 10.0 HDKAJ-11451 OHV Gas 10000 83.3 amps, 120/240 volts, single phase 41.5 x 22.2 x 14.4 inches

Frequently Asked Questions:

1. What are the signs that your Onan generator is not running properly?

🔧The most common sign of Onan generator problems is that it won’t start or stay running. You may also notice that it is making unusual noises, running roughly, or having trouble maintaining the appropriate voltage.

2. What should I do if my Onan generator won’t start?

🔨Check the fuel level, oil level, air filter, and spark plugs. If all of those are fine, you may need to seek professional help to diagnose further issues.

3. How often should I perform maintenance on my Onan generator?

🔩Standard maintenance – oil changes, fuel system maintenance, and air filter replacements – should be done every 300 hours of use or once per year, whichever comes first. If you use your generator heavily, you may need to perform maintenance more frequently.

4. Can I manually turn on my Onan generator?

🏃Yes, you can. However, it’s important to follow the proper procedure to avoid damaging the generator. Refer to your owner’s manual for instructions on how to manually start your generator.

5. How do I know if my Onan generator needs a new air filter?

🌬️If the air filter is clogged or dirty, it may cause your generator to run poorly or not at all. You can check the air filter by visually inspecting it. If it’s dirty or clogged with debris, it’s time to replace it.

6. How do I check the oil level in my Onan generator?

🥢The oil level can be checked by using the dipstick. First, wipe the dipstick clean, then insert it into the oil filler tube. Remove the dipstick again and check the oil level, which should fall between the high and low marks on the dipstick.

7. How long can an Onan generator run continuously?

🏭The duration that an Onan generator can run continuously depends on the model and load conditions. However, in general, a well-maintained Onan generator can run for up to 4-5 days continuously.

8. What are the signs that the fuel filter needs to be replaced?

🧹One of the most common signs that a fuel filter needs to be replaced is a sudden decrease in generator power or a complete shut down. Other signals of a damaged or clogged fuel filter may include a foul odour, power loss when accelerating or difficulty starting.

9. How long does an Onan generator last?

📅The lifespan of an Onan generator will vary depending on usage and maintenance, but if properly cared for, an Onan generator can last for up to 15 years or more.

10. What is the most affordable option for Onan generator maintenance?

🤝The most affordable option for Onan generator maintenance is to do it yourself. Keep up with the maintenance schedule by performing oil changes, air filter replacements, and fuel system maintenance as needed. Use your owner’s manual to guide regular maintenance work, but it’s important to be mindful of any potential dangers

11. What will happen if I overuse my Onan Generator?

🤒If you overuse your Onan generator, there is a high possibility of damaging the engine. Overusing can result in overheating your engine which can lead to a seizure, making you incur high repair costs.

12. How can I tell if my Onan generator has a carburettor problem?

🧰The biggest indicator of carburetor problems is the generator’s sudden shut down. Other symptoms of carburetor problems include backfiring or overheating. Should you experience any of these symptoms, it’s important to seek professional help.

13. How can I tell if there is a problem with the Onan generator starter motor?

🔑A bad or faulty starter motor can cause your generator to fail to start. If you turn the key and hear a click but the motor does not start, it may indicate the starter motor is bad. Similarly, if the starter motor engages but doesn’t turn the engine, then the starter motor should be inspected. Consider seeking professional help to diagnose the problem.


👍We hope this article was helpful to you in resolving your Onan generator problems. As discussed, there is no one-size-fits-all solution to generator issues, but by following the troubleshooting process, you can identify and fix specific issues that could be causing your generator to shut down. By staying on top of maintenance and addressing problems as they arise, you can keep your Onan generator functioning smoothly. Remember, Always put your safety first and seek professional help if in doubt.

👍So, if you have appreciated this article and find the information enlightening and practical, please share it with those around you who may be facing similar problems.


🛑The information provided in this article is for general informational purposes only. The content is not intended to be a substitute for professional advice. Always seek the advice of a qualified professional before making any changes to your generator. Reading this article does not establish a professional relationship with the author or any other entity referenced in this article.

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