Mercedes Mullins
The fuel filter on a 115 Johnson is located inside the lower cowl, where the external fuel line connects to the cowl. To access the filter, you need to remove the breather cover and follow the fuel line to the carbs. There, you will find a nut that can be unscrewed by hand, revealing a cone-shaped filter that can be removed and cleaned. Some users have also recommended installing a fuel/water separator in addition to the fuel filter to prevent debris and water from entering the engine. This setup is said to work well for boats with large fuel tanks or fuel that sits for long periods.
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What You'll Learn
The fuel filter is a clear amber-looking component inside the lower cowl
The fuel filter is located inside the lower cowl of a Johnson 115. It is a clear amber-looking component, and you will need to remove the breather cover to access it. It is situated where the outside fuel line connects to the cowl.
To get to the filter, follow the fuel line to the carbs, where you will see a nut that can be unscrewed by hand. Inside, there is a cone-shaped filter that can be removed and cleaned. It is important to keep the fuel filter clean to ensure the engine receives an uninterrupted fuel supply.
A clean fuel filter can help address issues with the engine's performance, such as coughing or spitting. However, it is essential to note that other factors could be causing these problems, so further investigation may be necessary.
In some cases, the fuel filter may become stuck, requiring additional tools and force to remove it. This issue can be resolved by using a strap wrench, large slip joint pliers, or duct-taping a screwdriver to gain a better handle for turning.
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It is located behind the air box cover
The fuel filter on a 115 Johnson is located behind the air box cover. To access the filter, you will need to remove the breather cover. Follow the fuel line to the carbs, and you will find a nut that can be unscrewed by hand. Inside, you will see a cone-shaped filter that can be removed and cleaned or replaced if necessary.
It is important to regularly check and maintain your fuel filter to ensure optimal performance and prevent any fuel-related issues. Fuel filters can become clogged with debris or water, leading to problems such as the engine not receiving enough fuel or the boat struggling to get on a plane.
Some people choose to install a fuel/water separator in addition to or instead of the standard fuel filter. This can be purchased from Walmart and installed on the transom between the primer bulb and the fuel line quick-disconnect. It acts like an oil filter on a car and can help keep debris and water out of the motor, reducing the chances of fuel separation and engine issues.
If you are experiencing fuel-related problems even after replacing the fuel filter and adding fuel treatment, there could be other underlying issues. For example, the primer bulb on the fuel line should remain firm, and if it loses firmness, it may indicate trash or water in the system. It is recommended to drain the carbs a couple of times a year and use a fuel stabilizer to prevent fuel separation.
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You need to remove the breather cover to access the filter
To access the fuel filter on a Johnson 115, you need to remove the breather cover. This will expose the fuel line, which you can then follow to the carbs. Here, you will see a nut that can be unscrewed by hand. Inside is a cone-shaped filter that can be removed and cleaned.
The breather cover is an essential component of the engine, providing ventilation and allowing the engine to breathe. By removing this cover, you gain access not only to the fuel filter but also to other essential components for maintenance and repair.
It is important to note that the breather cover is typically secured in place to protect these internal components. You may need to carefully loosen any fasteners or screws to safely remove the cover without causing damage. Always refer to the manufacturer's guidelines or seek professional assistance if you are unsure about any steps in the process.
Additionally, when working on your Johnson 115, it is crucial to follow proper safety protocols. Ensure the engine is turned off and has cooled down before attempting any maintenance or repairs. This will help prevent accidental injuries or further complications.
By removing the breather cover, you will have direct access to the fuel filter and other essential engine components. This accessibility allows for convenient inspection, cleaning, or replacement of the fuel filter as needed to ensure the optimal performance of your Johnson 115.
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A fuel/water separator can be purchased at Walmart for $27
If you own a Johnson 115, you may be looking to replace the fuel filter. One user reported that their 2000 Johnson 115 was acting up, and they were advised to replace the fuel filter. They found the fuel filter inside the lower cowl where the outside fuel line connects. To access the filter, you will need to remove the breather cover and follow the fuel line to the carbs. You will then see a nut that you can unscrew by hand, revealing a cone-shaped filter that can be removed and cleaned.
One way to prevent debris and water from entering your motor is to install a fuel/water separator. Walmart sells a fuel/water separator for $27, with $8 replacement cartridges. This device works similarly to a car oil filter and can be installed between the primer bulb and fuel line quick-disconnect on your motor. It is essential to take your time during installation to avoid kinking your fuel lines.
Another option for a fuel/water separator is the WIX Spin-On Fuel/Water Separator Filter, which Walmart sells for $27.72. This product comes with free 90-day returns and can be purchased online.
If you are looking for a fuel/water separator for a Cummins engine, Walmart offers the Cummins FS20176 Fuel/Water Separator for $22.28. This product has replacement cartridges available in packs of two for $33.63.
For Ford owners, Walmart offers the Dorman 904-020 Fuel Water Separator Check Valve O-Ring Kit, which fits select 1999-2003 Ford F250 and F350 models. This product is available for $12.60.
Finally, for diesel engine owners, Walmart offers the iFJF R12T Fuel Water Separator Marine 120AT kit for $20.73. This product includes two fittings and two plugs and is designed to replace the S3240 18-7947 fuel filter.
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The filter can be cleaned or replaced
The fuel filter on a Johnson 115 can be cleaned or replaced. To clean it, you will need to remove the breather cover to access the filter. Follow the fuel line to the carbs, where you will find a nut that can be unscrewed by hand. Inside is a cone-shaped filter that can be removed and cleaned. It is recommended to install a fuel/water separator as well, which can be purchased from Walmart for $27, with $8 replacement cartridges. This will help to keep debris and water out of the motor and prevent fuel problems. Make sure to take your time during the installation process to avoid any issues with fuel lines.
When cleaning the fuel filter, it is important to be careful and gentle to avoid damaging the filter. It is also essential to ensure that the area is well-ventilated and that you are wearing appropriate protective gear, such as gloves and eye protection. If the filter is heavily soiled or damaged, it may be more advisable to replace it entirely rather than cleaning it.
To replace the fuel filter, you can follow similar steps as cleaning it. Remove the breather cover and locate the fuel line to the carbs. Unscrew the nut and carefully take out the old filter. Insert the new filter in its place and secure it by screwing the nut back on. Ensure that the new filter is compatible with your Johnson 115 model and purchase it from a reliable source.
It is recommended to inspect and clean or replace the fuel filter regularly to maintain the performance and health of your Johnson 115 engine. Cleaning or replacing the fuel filter can help improve fuel efficiency, engine performance, and reduce the risk of fuel-related issues. Depending on your usage and boating conditions, you may need to perform this task more or less frequently. Always refer to the owner's manual or seek professional guidance if you are unsure about the process or the specific needs of your boat.
Additionally, it is worth noting that some people choose to install a disposable inline fuel filter, such as the Tempo disposable inline fuel filter, for their Johnson engines. This can provide additional filtration and protection, especially if the boat is used regularly for trolling or has a large fuel tank. However, it is essential to consider your specific needs and boating applications when deciding on the necessary filters and maintenance routines.
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Frequently asked questions
The fuel filter on a 115 Johnson is located behind the air box cover. You will need to remove the breather cover to get to the filter. Follow the fuel line to the carbs and you will see a nut that you can unscrew by hand. Inside is a cone-shaped filter that you can remove and clean.
The fuel filter is cone-shaped and is located inside a nut that can be unscrewed by hand.
A fuel/water separator is a device that helps to keep debris and water out of your motor. It is not required, but it is good preventive maintenance, especially if you have a large fuel tank where fuel sits for long periods. Walmart sells a good unit for $27.
There could be other issues such as the power pack going bad, or the primer bulb on the fuel line not remaining firm.
