Rajan Wilcox
The Onan generator is a popular choice for those seeking a backup power source. With various models available, such as the Onan 5500, users have reported different fuel tank capacities, ranging from 18 to 30 gallons. The generator can run on gasoline or liquid propane (LP), with some models accommodating both fuel types. While gasoline is easily accessible, LP offers advantages such as a longer shelf life, cleaner combustion, and reduced maintenance due to less carbon buildup. However, the choice of fuel type influences the design and refilling process. This article will explore the fuel tank configurations and considerations for the Onan generator, shedding light on the options available to consumers.
| Characteristics | Values |
|---|---|
| Fuel tank capacity | 18 gallons for the generator tank, 30 gallons for the fuel station |
| Fuel type | Gasoline, LP |
| Fuel octane | 87, 94 |
| Fuel additives | Sta-bil, Seafoam |
| Fuel treatment | OnaFresh GXLP Fuel Stabilizer, StarTron, Mercury marine outboard ashless 2-stroke oil |
| Fuel consumption | 40 lbs. for 10 to 13 hours |
| Fuel gauge | Gauge light on the inside control panel |
| Fuel drain | No built-in drain, but can be drained manually |
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What You'll Learn
Onan generator fuel tank size/capacity
Onan generators are usually integrated with a mobile fuel station and a tank. The fuel tank size varies depending on the model of the Onan generator.
The Onan 5.5 generator comes with a 30-gallon tank. The Cyclone Onan generator has a 20-gallon front tank for the generator and a 30-gallon rear tank for the fuel station. The XLR Thunderbolt 386x12HP Onan generator has two separate tanks: an 18-gallon tank for the generator and a 30-gallon fuel station tank.
The Onan P4500i Extended Run Time Fuel Kit is compatible with the Onan P4500i, Pulsar PG4000iSR, and Westinghouse iGen4500 generators. This kit does not include a fuel tank, as customers often require different sizes. The kit can be used with any size remote fuel tank and allows users to alternate between as many tanks as they like.
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Checking the fuel level in the generator tank
The Onan generator is a popular option for those seeking a quiet, integrated, and theft-proof generator, especially for use in campers. It is known for its ability to run an entire camper while being quiet and is often integrated, so users don't have to worry about carrying it around or having it stolen.
The Onan generator comes in different models, such as the Onan 4000 and the Onan 5000, and some models have fuel tanks, while others don't. For example, the Onan 4000 generator has a fuel tank, while the Onan 5Kw generator may need to be hooked up to an external fuel tank.
- Understanding Fuel Level Indicators: Onan generators may have different ways of indicating fuel levels. Some models might have a fuel gauge or a fuel level indicator light, while others might not have a dedicated gauge but instead rely on a blinking light or other indicators when the fuel level is low. Understanding how your specific Onan generator model communicates fuel levels is essential for proper monitoring.
- Visual Inspection: If your Onan generator has a visible fuel tank, you can simply look at the fuel level through the tank's walls if they are transparent or through a fuel level indicator window, if present. This method provides a quick and easy way to estimate the fuel level without any tools.
- Checking the Fuel Line: In some Onan generators, the fuel line connecting to the carburetor can be used to check the fuel level. By disconnecting the fuel line and attempting to start the generator, you can observe if fuel is pumping through the line. If there is no fuel pumping, it indicates that the tank might be empty or that there is an issue with the fuel pump or filter.
- Fuel Tank Capacity and Runtime: Knowing the fuel tank capacity of your Onan generator and its approximate runtime at different load levels can help you estimate the fuel level without direct measurement. For example, if you know your generator can run for 8 hours at a certain load on a full tank, and you've been running it for 4 hours, you can estimate that the fuel level is approximately halfway.
- Hour Meter and Fuel Usage: Many Onan generators have an hour meter that tracks the generator's usage. By keeping track of the generator's runtime and the amount of fuel added, you can estimate the fuel consumption rate. This information can help you calculate the approximate fuel level based on the generator's runtime since the last refuel.
- Fuel Stability and Storage: Onan generators can run on different types of fuel, including gasoline with or without ethanol. It's important to use the recommended fuel type and properly maintain the fuel to ensure stability. Ethanol-blended gasoline, for instance, should not be left sitting in the tank for extended periods, as it can cause performance issues.
- Low Fuel Shutdown: Onan generators are designed with a low fuel shutdown feature to prevent engine damage. This feature typically activates when the fuel level reaches a certain threshold, such as a quarter or a third of the tank capacity. Understanding this threshold is essential to anticipate when the generator will shut down due to low fuel.
By following these steps and considerations, you can effectively check the fuel level in your Onan generator tank and ensure optimal performance. Remember to refer to your specific Onan generator model's user manual for detailed instructions and safety precautions related to fuel handling and level checking.
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Best fuel octane for Onan generators
Onan generators are gasoline-powered. While some sources suggest that 87 octane is the standard for these generators, others have used gasoline with an octane rating as low as 85. One source notes that they are switching to 94 octane with a 10% ethanol blend.
Ethanol can reduce fuel economy, and it is recommended to use non-ethanol fuel in Onan generators. One source notes that they use non-ethanol fuel in all their gas equipment, and everything starts without issue even after sitting for months. Another source notes that ethanol-laced gasoline can damage iron valves. However, another source notes that you can run 10% ethanol gasoline in an Onan generator, but it may require a carburetor readjustment. It is also important to note that gasoline can go bad over time, so it is recommended to use fresh gasoline and properly store any fuel.
It is important to consult the generator's manual and the recommendations of the manufacturer to ensure the correct fuel is being used.
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Using ethanol in Onan generators
Onan generators are fuelled by gasoline. Ethanol is sometimes added to gasoline to create a blended fuel. This blended fuel is known as gasohol or flex-fuel.
Ethanol blended gas comes in 10% (E10), 85% (E85), and the very rare 15% (E15) concentrations. E10 is a blend of 10% ethanol and 90% gasoline, while E15 is a blend of 15% ethanol and 85% gasoline.
Secondly, ethanol has a lower energy content than E0 gasoline, so more fuel is required to produce the same amount of power. This can reduce fuel economy and increase costs.
Thirdly, ethanol attracts and holds water, which can lead to phase separation if there is too much water for the ethanol to hold. This can cause issues with the generator's performance and damage the engine.
Finally, ethanol can cause carburetor issues and require readjustment. It is also important to note that ethanol-blended gasoline with more than 10% ethanol should never be used in small engines unless explicitly approved by the manufacturer.
To avoid these issues, it is recommended to use non-ethanol gasoline in Onan generators. This can be purchased at some gas stations, hardware stores, marinas, and airports. Additionally, fuel stabilizers like Sta-bil and Seafoam can be used to neutralize ethanol in gasoline, allowing the use of regular gas without damaging engines. However, running the generator every two weeks and using fresh gas are also recommended when using ethanol-blended fuels.
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Draining the Onan generator fuel tank
The Onan generator is a popular choice for those seeking a quiet, integrated, and theft-proof power solution for their camper or RV. It is often praised for its large fuel tank capacity, which can hold up to 30 gallons of fuel, eliminating the need for refuelling in the middle of the night.
However, proper maintenance of the Onan generator includes ensuring that the fuel is fresh and suitable for use. Draining the fuel tank may become necessary if the fuel has been sitting for a prolonged period or if there are concerns about fuel quality. Here are some steps and considerations for draining the Onan generator fuel tank:
- Consult the User Manual: Before attempting any fuel drainage or maintenance, it is essential to refer to the user manual provided by the manufacturer. This manual should outline the specific procedures and precautions for your Onan generator model.
- Fuel Stabilization: To maintain fuel freshness, consider using fuel stabilizers, especially if you anticipate infrequent generator usage. Fuel stabilizers help prevent fuel degradation and maintain fuel quality over time.
- Fuel Type: The type of fuel used in your Onan generator is crucial. While some users have reported successful operation with 10% ethanol gasoline, others have cautioned against leaving such fuel in the tank for extended periods. Non-ethanol fuel is generally recommended for small engines to ensure optimal performance and avoid potential issues.
- Draining Procedure: The exact procedure for draining the Onan generator fuel tank may vary depending on your specific model. Some models may have a fuel shut-off valve or a fuel drain valve that facilitates easier drainage. Consult your user manual or seek advice from a qualified technician if you are unsure about the drainage process for your particular model.
- Fuel Replacement: After draining the old fuel, it is essential to refill the tank with fresh, suitable fuel. Ensure you use the correct type of fuel as specified by the manufacturer to avoid performance issues and potential damage to the generator.
- Fuel Odour and Quality: Bad fuel typically has a distinct odour. If you suspect that the fuel has degraded or is contaminated, it is advisable to drain the tank and replace it with fresh fuel.
- Fuel System Priming: When refilling the fuel tank, remember to prime the fuel system by pressing the start button. This action runs the pump without actually starting the generator, ensuring that the new fuel is properly circulated.
Remember to exercise caution when handling fuel, and always refer to the manufacturer's guidelines and safety instructions for the best practices specific to your Onan generator model.
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Frequently asked questions
Yes, the Onan generator has a fuel tank. The fuel tank capacity varies depending on the model. For example, the Onan 5500 has a 30-gallon tank, while the Onan 5.5 has a 20-gallon tank.
The fuel level in the Onan generator fuel tank can be checked using a gauge in the control panel. This gauge typically has a rocker switch that allows you to view the fuel level in either the generator tank or the rear tank.
Onan recommends OnaFresh GXLP Fuel Stabilizer for their generators. Other fuel treatments and stabilizers that have been mentioned by Onan generator users include Sta-bil, Seafoam, and StarTron.
