3 Ways To Fix Onan Generator Fault Code 36

Recreational vans or motorhomes have become quite ubiquitous lately, thanks to the freedom they offer. Whether you are planning a short trip to your neighborhood or a long camping trip, an RV can benefit you in many ways.

With a motorhome, you enjoy the comfort of your home even while traveling. From microwave ovens to TVs, you can have many appliances in your motorhome.

But where do you get the electricity from? Of course, that is made possible with the help of generators. They provide power to all the appliances in your motorhome, ensuring a comfortable journey.

Most motorhomes nowadays come with in-built generators. However, if you own a model that does not have one, you will have to buy it separately.

Onan is a popular choice when it comes to generators for RVs. With experience of over 30 years, the company surely knows how to produce quality RV generators. It has manufactured many top-of-the-line generators over the years and enjoys a great reputation in the industry.

While Onan generators offer many great features, some problems may arise while using them. Fault code 36 is one such problem that many users have complained about. This problem causes the engine to shut down without a panel command.

But why does this problem happen, and more importantly, how to fix it? Today, we will be discussing some effective workarounds to troubleshoot the Onan generator fault code 36. Let’s jump straight onto it!

How to Fix Onan Generator Fault Code 36?

Some solutions to fix the Onan generator fault code 36 are:

1. Check Fuel Pump and Filters

If you are getting the Onan generator fault code 36, start by checking the fuel pump and filters. The fuel pump is a component that is responsible for taking fuel from the tank and delivering it to the carburetor.

It plays a key role in the proper functioning of your Onan generator, and if there is something wrong with it, the control panel will show you fault code 36.

To replace the fuel pump in your Onan generator fault code 36, make sure to clamp the fuel line first, so it doesn’t spill out the fuel. And yes, do not forget to turn off the battery too. Then use a wrench to take out the solenoid and access the fuel pump.

Once you have removed the faulty fuel pump, replace it, and this will fix the problem. Be mindful that this section has wires and other sensitive components, so remove the pump gently.

The last thing you’d want is to damage some other component while repairing. Furthermore, make sure to apply some gasket dressing to your fuel pump before installing it.

Sometimes, the problem could be with the fuel filters of your Onan generator fault code 36. Any expert will tell you the importance of fuel filters. They are important for your generator as they keep dust and other foreign substances from entering your generator’s engine.

If the fuel filter is clogged, the particles will find their way into the engine, damaging the fuel pump and other components.

If you suspect that the fuel filter is the culprit, consider replacing it to fix the Onan generator fault code 36. Fortunately, the process is pretty straightforward, and you can do it at home in ten minutes.

The fuel filter lies beneath the access panel in most Onan generators. However, its location may vary depending on your model. So, it is a good idea to refer to the user manual to locate it. The access panel is easy to open, and you don’t require any tool for it.

The fuel filter in the Onan generator fault code 36 is securely held in place by a single bolt in its center. First, take a cloth and clean all the debris and dust particles on the fuel filter. Then loosen the nut on the fuel line with a wrench.

It is important to note that some fuel will spill out of the fuel lines during the process. When done, repeat the same process on the other filter line as well.

Next, remove the bolt and take off the fuel filter. Be mindful that it still has fuel, so remove it gently, or else it may spill out. And yes, the fuel may keep dripping for a few minutes, so it would be better to use a drain pan.

Now install the new fuel filter carefully and tighten all the nuts using a wrench. Wipe off the fuel drips once you have replaced the fuel filter and turn your generator on to see whether it has fixed the problem or not.

2. Check Fuel in Generator

According to the operator manual, low fuel is one of the primary reasons for Onan generator fault code 36. You must have at least more than one-fourth of the fuel tank filled, or the engine may shut down. It is recommended to check the fuel level every time you use it.

3. Check Spark Plugs

Defective spark plugs are another reason for the Onan generator fault code 36. These plugs are important for fuel combustion; if they have gone bad, the engine will either not start or shut down after a few minutes.

The spark plug is connected to wires. Visually inspect them; if they are damaged, you will need to replace them. However, if they look fine, the issue is certainly with the spark plugs.

If your generator was running before you decided to replace them, it would be better to wait for a few minutes to let them cool down. They are hot, and touching them instantly may burn your hands.

This is why it is advised to wear safety gloves before engaging in any repair or replacement. If you are replacing the spark plugs for the first time, find out where they are located.

The operator manual may come in handy if you are unsure about it. Then disconnect the wires connected to it. Next, take a cloth and clean the entire area. Dust particles may get inside the engine, which may cause problems later.

Once you have cleaned it, remove the old defective spark plug using a socket and ratchet and simply install the new one.

Before undertaking any repair or replacement, it is important to disconnect your Onan generator first to ensure your safety. Moreover, consider visiting a professional if it all seems too complicated.

The replacement process requires many tools you may not have at home. Professionals have all the tools and knowledge to deal with these generators.

The solutions mentioned above are likely to fix the Onan generator fault code 36, and your generator will start working properly. However, if the problem persists, the Onan customer care service will surely help you figure it out.

The Bottom Line

Onan generator is a go-to choice for many RV owners, thanks to its exceptional fuel efficiency and quiet operation. However, its fault code 36 can shut down the engine sometimes. This could happen for various reasons, which we have discussed in this troubleshooting guide.

Ensure your generator has enough fuel and the fuel pump and filters are in good working condition. If you are unable to identify the reason, consider seeking professional help.