Mercedes Mullins
Fuel lines are an essential component of any boat engine, but they can be a source of frustration for boat owners due to the lack of standardisation in fuel fittings. This means that fittings come in various shapes and sizes, and a wrong fit can lead to fuel leaks, engine cut-offs, and even safety hazards. To avoid these issues, it is important to select the correct fuel line and fittings for your specific engine and to understand how to properly seal and maintain them. This includes considerations such as the type of thread sealant to use, the use of filters when refuelling, and the need to store fuel lines out of direct sunlight to prevent ageing and cracking.
| Characteristics | Values |
|---|---|
| Fuel Tank Capacity | 12L or 25L |
| Fuel Tank Price Range | £25.95 to £104.95 |
| Hose Material | Thermoid hose |
| Hose Length | 25 feet |
| Hose Cost | $17.00 for 25 feet |
| Hose Diameter | 1/4″ or 5/16″ |
| Hose Protection | 303 |
| Hose Colour | Black |
| Hose Best Practice | Store out of the sun |
| Hose Clamps | Marine-grade stainless steel |
| Hose Barb | Long enough to fit both clamps |
| Thread Type | NPT or NPTF |
| Thread Sealant | Liquid or paste type |
| Fittings | Vary by manufacturer and year |
| Fitting Type | Quick-release or universal |
| Fitting Customization | Available for spigot-type connectors |
| Primer Bulbs | Required for older engines |
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What You'll Learn
Fuel tank capacity and price range
Fuel line fittings for outboards vary depending on the engine manufacturer, year, and horsepower. There is no standardisation on fuel fittings, so they come in various shapes and sizes. Quick-release connectors are available for simple disconnection and quick switch-over to a secondary tank. Budget entry-level tanks tend to have thinner walls and are less durable, while more expensive models offer features like quick-release connections and level gauges.
Now, for fuel tank capacity and price range:
The capacity and price of fuel tanks for outboards can vary depending on the specific requirements and engine specifications. The standard fuel tank capacities commonly available are 12 litres or 25 litres. The 12-litre tank is suitable for smaller outboards with less than 30 horsepower, while the 25-litre tank caters to bigger engines with higher fuel consumption. The price range for these fuel tanks starts from £25.95 and can go up to £104.95. The more expensive models tend to have additional features, such as quick-release connections and level gauges, enhancing their durability and functionality.
It is important to note that the fuel consumption of an outboard motor is influenced by various factors, including engine speed, trim, and operating conditions. To determine the exact fuel consumption of your engine, it is recommended to perform a fuel consumption test. This involves filling a portable fuel tank with a single, measured gallon of fuel and running the outboard at wide-open throttle until the tank is empty. By recording the time taken to burn the fuel, you can calculate fuel consumption in terms of time, speed, and distance.
Additionally, it is worth mentioning that some boats have permanent fuel tanks built into their structure, while others may have portable tanks that can be added or removed as needed. If you feel that your boat's fuel capacity is insufficient, you can consider upgrading the existing tank or incorporating portable tanks to increase the overall fuel capacity.
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Quick-release tank connectors
The Quicksilver range of tanks, for example, offers a Mercury/Mariner quick-release connector that's compatible with other engine brands as long as the tank connector matches. This quick-release connector ensures a smooth connection to the engine end of the fuel line. Additionally, the Quicksilver brand is known for its high-quality engine oils, parts, and accessories, providing peace of mind to boat owners.
When considering quick-release tank connectors, it's important to keep in mind the different types of fittings available. Universal lines, for instance, can be customised to fit any engine, making them a versatile option. Primer bulbs are another crucial component, as they help 'prime' the engine with fuel. It's recommended to always check the condition of the bulb to prevent leaks, although some modern EFI engines may not require them due to their internal pump design.
In addition to quick-release connectors, fuel tanks come in various capacities to cater to different outboard sizes. The standard sizes are 12L and 25L, with the former being suitable for smaller outboards under 30hp, while the latter accommodates bigger engines with higher fuel consumption. The price of these fuel tanks can range from £25.95 to £104.95, with the more expensive models offering features like quick-release connections and level gauges.
Lastly, when installing or maintaining your fuel system, it's advisable to use stainless steel hose clips to secure the end fittings and primer bulbs. This ensures a tight and secure connection, preventing any potential fuel leaks.
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Hose clips to fasten end fittings
Hose clips, also known as hose clamps, are mechanical devices used to fasten hoses onto fittings. They are typically made of stainless steel, which provides durability and resistance to corrosion. Hose clips come in a variety of types and sizes to suit different applications. For example, heavy-duty hose clamps are ideal for applications that require extra strength and a secure hold. Large jubilee clips are another common variation used for fastening bigger hoses or pipes. These are widely used in automotive, industrial, and household settings.
When using hose clips to fasten end fittings for an outboard fuel line, it is important to consider the size and type of the hose clip. Stainless steel hose clips in the range of 9.5-12mm and 11-16mm can be used, with the latter providing more movement to fit over the hose when the fitting is pushed in. It is also worth noting that outboard fuel fittings are not standardised and come in various shapes and sizes, so it is important to select the appropriate hose clip for your specific application.
To install the hose clips, it is recommended to use the proper tool designed for this purpose, which can be purchased online or at a local hardware store. While it is possible to use two screwdrivers pushed in opposite directions to tighten the hose clips, this method requires a massive amount of effort and carries a risk of damaging the surrounding components or injury.
By following these instructions and selecting the appropriate hose clips, you can securely fasten the end fittings of your outboard fuel line, ensuring a tight connection and preventing leaks.
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Thread sealant for fuel pipes
When it comes to sealing the pipe threads found on fuel system components, it is critical to first determine the thread type of the component you are purchasing and then match it with the corresponding thread type. The most common thread type in fuel line components is NPT, which is a tapered thread commonly found in plumbing connections in North America. NPTF is another type of tapered thread that is also used in fuel line components. Both NPT and NPTF threads require the use of a sealant.
To choose the appropriate thread sealant, consider its chemical resistance to the type of fuel (diesel or gasoline) or oil running through the line. While some people have used regular gas-resistant Teflon tape (yellow) with success, it is not recommended as it can break free and cause clogging issues. Liquid or paste-type thread sealants are generally preferred as they are less likely to cause clogging issues.
There are several thread sealants available on the market that are suitable for fuel pipes. One option is to use a Teflon-based plumber's paste-type sealant on the pipe threads, while allowing the flare fitting to go together dry. Another option is to use a thread sealant specifically designed for pipe joints, such as Permatex or Loctite brand sealants. These sealants are resistant to gasoline and other fluids, making them suitable for fuel pipe applications.
It is important to note that some sealants, such as Permatex #2, are not suitable for use with gasoline or alcohol as they can dissolve. Always check the compatibility of the sealant with the specific type of fuel or oil you are using. Additionally, when making connections from a threaded port to a hose barb connection, it is recommended to follow the ABYC guidelines and use two marine-grade stainless steel hose clamps at each connection point.
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$55.18 $58.91
Hose clamps at connection points
Hose clamps are essential for securing hoses and preventing leaks that could potentially damage your engine or other marine systems. They are typically placed at the ends of the hoses near the fittings or connectors they are securing. This ensures the clamp provides a secure grip on the hose and prevents leaks or disconnections at the critical connection points.
Hose clamps have a band that encircles the hose and a screw that applies pressure and compresses the hose onto the fitting. This ensures a firm connection and helps to prevent the hose from slipping off or leaking. It is important to tighten the screw or bolt on the hose clamp clockwise with a screwdriver or an appropriate tool until the clamp firmly holds the hose in place.
When selecting hose clamps, it is important to choose high-quality marine-grade hose clamps that are specifically designed for the harsh saltwater environment. These clamps are usually made from high-quality stainless steel with a minimum of 10% chromium for corrosion resistance. For superior protection, marine clamps can contain up to 25% chromium, often with added nickel, manganese, or molybdenum for enhanced corrosion resistance and virtually non-magnetic properties.
It is also important to regularly inspect and replace hose clamps as they can fail due to various reasons, including corrosion, material fatigue, improper installation, excessive pressure or temperature, and aging. By choosing the appropriate clamp type and maintaining them properly, you can maintain reliable connections and ensure the smooth operation of your outboard engine.
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Frequently asked questions
Some issues with outboard fuel lines include leaks, clogging, and ripping open.
Some quick fixes include using grease on the end fittings at the tank and motor, and replacing the entire line, bulb, and connector.
Some ways to prevent issues with outboard fuel lines include using stainless steel hose clips to fasten the end fittings, using a filter funnel when filling the fuel tank, and storing the fuel line out of the sun.
