Mercedes Mullins
Mercury fuel lines may need to be replaced due to degradation caused by ethanol in fuel. The degradation can cause particles from the internal lining to shed into the fuel system, potentially leading to costly repairs. Boat owners should regularly inspect their fuel lines for discolouration and flexibility, and consider replacing old fuel lines with ethanol-rated alternatives. When replacing fuel lines, it is important to use the correct tools, such as wire cutters and a pinch clamp tool, to avoid damage and ensure a secure connection. Additionally, the use of oil can aid in assembling fittings and hoses.
| Characteristics | Values |
|---|---|
| Fuel line material | Rubber, stainless steel, nylon |
| Fuel line length | 6 feet, 7 feet, 9 feet |
| Fuel line diameter | 5/16"<co:2>, 3/8</co:2>" |
| Fuel type | Ethanol blended fuels |
| Engine compatibility | Marine, Mercury, Johnson Evinrude, Yamaha Outboard, etc. |
| Installation | Easy, kink-free, comes with clamps |
| Other features | Primer bulb, double check valve, speed prime technology |
What You'll Learn
Mercury fuel line clamp removal and installation
The clamps used in the Mercury Fuel line are called pinch clamps. To remove them, you can use wire cutters. Alternatively, you can also use C4 to remove them.
To install new clamps, you can use a pinch clamp tool. You can find a set of these tools on Amazon.
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Choosing the right hose
Compatibility
Ensure that the replacement hose is compatible with your specific Mercury outboard model and engine type. Each engine has unique fittings, and using an incompatible hose can lead to leaks and reduced performance. Check your engine manual or consult a Mercury outboard specialist to determine the correct hose for your engine.
Material
The material of the fuel hose plays a vital role in its durability and performance. Mercury outboard fuel hoses are typically made from a combination of rubber, plastic, and steel.
- Rubber provides flexibility and resistance to abrasion, ensuring the hose can withstand the vibrations and movements of your boat without cracking or chafing.
- Plastic adds strength and durability to the hose, making it less susceptible to punctures and tears.
- Steel enhances the hose's resistance to punctures and tears, especially when navigating through tight spaces or around sharp objects.
Inner Diameter
The inner diameter of the fuel hose should match the fittings on your engine and fuel tank. A mismatch in diameter can lead to fuel leaks and reduced engine performance. Check the specifications of your engine to determine the correct inner diameter for your hose.
Length and Routing
Measure the distance between your engine and fuel tank to ensure the replacement hose is long enough. Also, consider the route the hose will take. Avoid sharp bends and kinks, as these can restrict fuel flow and reduce the lifespan of the hose. It is essential to follow the manufacturer's recommendations for hose routing to ensure optimal performance and safety.
Certifications
When choosing a replacement fuel hose, look for those that meet EPA and CARB certifications. Additionally, hoses that are UL-listed and FM-approved ensure that they have been tested and meet specific safety standards. These certifications provide assurance that the hose is less permeable, reducing the risk of fuel evaporation and vapour lock.
Hose Condition
Always inspect the condition of the hose before installation. Look for any signs of damage, such as cracks, cuts, or wear. Ensure the hose is flexible and free from discolouration or brittleness. A visual inspection can help identify potential issues and prevent future problems.
By considering these factors, you can choose the right hose for your Mercury outboard fuel line replacement, ensuring optimal performance, safety, and longevity.
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Hose length
The hose length and size are important factors to consider when replacing the fuel line on a Mercury outboard engine. The hose length will depend on the specific engine model and the application, but there are some standard lengths available.
For Mercury outboard engines, the fuel line hose length commonly ranges from 6 feet to 9 feet. The most common fuel line hose length for Mercury outboards is 6 feet, which can be found on many universal fuel line kits. This length is suitable for most applications and can be cut to fit specific requirements.
It's important to note that Mercury outboard engines typically use either a 5/16-inch or 3/8-inch fuel line hose. The 5/16-inch fuel line is suitable for smaller outboards up to 115 HP, while the 3/8-inch fuel line is required for engines larger than 115 HP.
When selecting the hose length, it's important to consider the distance between the fuel tank and the engine, as well as any bends or routing that the hose needs to accommodate. It's always better to have a little extra length than not enough, as you can always trim the hose to size.
Additionally, make sure to choose a fuel line hose that is compatible with the type of fuel you are using. Some hoses are specifically designed for use with ethanol-blended fuels, gasoline, diesel, or bio-diesel blends. Using the correct hose will ensure the longevity of your engine and prevent fuel leaks, which can be dangerous on a boat.
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Hose compatibility
Hose Material
The material of the hose should be compatible with the type of fuel used in the Mercury outboard. Some hoses are designed for use with gasoline, diesel, or bio-diesel blends. For example, the Five Oceans 3/8" Outboard Motor Fuel Line is compatible with gasoline up to 85% ethanol-blended fuels, diesel, and all bio-diesel blends. It is essential to check the fuel compatibility to ensure the hose can withstand the type of fuel without degradation.
Hose Size
The size of the hose should match the fittings and connections on the Mercury outboard. The inner diameter (ID) and outer diameter (OD) of the hose must be considered. Common sizes include 5/16" and 3/8" inner diameters. For example, the Attwood 93806MUS7 Marine Boat Fuel Line Kit has a 3/8" inner diameter and is compatible with Mercury outboards.
Hose Length
The length of the hose should be sufficient to reach the required connections on the Mercury outboard. The hose must be long enough to connect the fuel tank to the engine comfortably. Hose lengths vary, with options such as 6 feet, 8 feet, and 9 feet available for Mercury outboards. Ensure the selected hose length suits your specific engine configuration.
Hose Fittings
The hose fittings and connectors should be compatible with the Mercury outboard fuel system. Some hoses come with quick-connect fittings, while others may require separate fittings to be purchased. Ensure the hose has the correct type and size of fittings for a secure and leak-proof connection. For example, the MERCURY OEM Fuel Line has quick-connect fittings and is 8 feet long, making it suitable for specific Mercury outboard models.
Hose Quality and Standards
It is essential to choose a hose that meets quality and safety standards. Look for hoses that are marine-grade and designed specifically for outboard motors. Some hoses may have approvals or certifications from organizations such as the Environmental Protection Agency (EPA) and the California Air Resources Board (CARB). For instance, the Five Oceans 3/8" Outboard Motor Fuel Line meets USCG type B1-15 SAE J1527 and ABYC Accepted Standards, ensuring its suitability for marine applications.
By considering these factors, you can ensure hose compatibility when replacing the fuel line on a Mercury outboard motor.
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Hose maintenance
Inspecting the Fuel Hose for Damage:
Before cleaning your fuel hose, thoroughly inspect it for any signs of damage. Check for any cracks, cuts, leaks, or signs of wear and tear on the hose. Pay close attention to the connections and fittings, ensuring they are secure and not loose or wobbly. Discoloration and brittleness of the hose are also indicators that it's time to replace the fuel line.
Cleaning the Fuel Hose and Fittings:
Once you've confirmed that the fuel hose is free of damage, it's time to clean it. Use a soft-bristled brush to gently remove any sediment or debris built up inside the hose. Avoid using harsh chemicals or abrasive cleaners, as they may damage the hose. Wipe down the fittings and connections with a clean cloth. It is also recommended to use a fuel line cleaning solution to effectively loosen and remove any stubborn grime or buildup. Remember to rinse the fuel hose thoroughly after cleaning.
Maintaining the Fuel Hose:
To ensure the longevity of your fuel hose, it is important to inspect and clean it regularly. Additionally, make sure to use the correct type of fuel as specified by the manufacturer. Using the wrong type of fuel can damage the hose and affect its performance. Keep the hose away from direct sunlight and high-temperature environments to prevent degradation.
Replacing the Fuel Hose:
Even with proper maintenance, fuel hoses will eventually need to be replaced. If you notice any signs of damage or if the hose is older than five years, it is best to replace it. When choosing a replacement fuel hose, ensure it is compatible with your Mercury outboard model and made from high-quality materials that can withstand the engine's specific requirements, such as temperature and pressure.
Hose Storage:
When not in use, store the hose in a cool, dry place away from direct sunlight. Ensure the storage area is well-ventilated and free from potential sources of damage, such as sharp objects or chemicals.
By following these hose maintenance guidelines, you can help ensure the optimal performance and longevity of your Mercury outboard fuel system.
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Frequently asked questions
It depends on the age of the fuel line and the type of fuel used. If you use ethanol, you may need to replace the line more frequently, as ethanol can cause the fuel line to degrade and break down over time. It's recommended to inspect your fuel line regularly and replace it if you notice any signs of deterioration.
Some signs that you may need to replace your Mercury outboard fuel line include discolouration, loss of flexibility, and the presence of debris or particles in the fuel system. If you notice any of these issues, it's recommended to replace the fuel line as soon as possible to prevent further damage or performance issues.
You will need a pinch clamp tool and wire cutters or side cutters. You may also find it helpful to have a dab of oil to smear on the fittings and hose to make assembly easier.
It is recommended to use a fuel line that is compatible with your Mercury outboard engine and is approved for use with the type of fuel you are using. Look for a fuel line that is durable, flexible, and resistant to degradation from ethanol-blended fuels.
