Katerina Swanson
Routing a fuel line into a fuel tank can be a complex process, and it's important to get it right to avoid costly mistakes. There are various factors to consider, such as the placement of the return line, which can vary depending on the type of vehicle and fuel system. For example, some people suggest returning fuel to the top of the tank, while others argue for returning it to the bottom to prevent aeration. It's also crucial to secure the fuel lines properly to avoid potential issues. In addition, the fuel filter should be mounted in an accessible location, and the lines should be kept away from rotating parts and heat sources.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Return line placement | Opinions vary; some sources suggest returning fuel to the top of the tank, while others recommend returning it to the bottom to prevent aeration. |
| Hose/tube usage | Recommended to use a hose/tube inside the tank to ensure fuel returns below the lowest level of fuel. |
| Fittings | The tank should have a fitting, but if there is a metal hose barb, it needs to be removed before screwing the fitting with white sealant into the tank. |
| Clamps and ties | Used to secure fuel lines; recommended to use cushioned clamps (e.g., Earl's or Adel style) and stainless steel locking ties. |
| Vent line placement | Should be installed as high as possible over the gas tank and attached to a fabricated bracket on the rear subframe. |
| Filter placement | Should be mounted in an accessible spot, away from rotating parts, the exhaust system, and potential driveline carnage. |
| Fuel pump placement | No specific value, but should be considered when laying out the fuel system. |
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What You'll Learn
Using a flexible fuel hose to connect the engine and tank
When using a flexible fuel hose to connect the engine and tank, there are several factors to consider. Firstly, the size of the hose is important. The hose should be sized according to the internal diameter, with options typically including 6mm, 10mm, 12mm, or 15mm. The size depends on the engine size and type of car, with smaller engines using narrower hoses and larger, fuel-injected cars requiring wider hoses.
It is also crucial to select the appropriate type of hose for the specific application. Different types of fuel require compatible hoses; for instance, diesel engines should use a hose marked "diesel," while high-ethanol fuels necessitate a hose capable of handling alcohol-blended fuels. Additionally, if the fuel pump is located inside the gas tank, a submersible hose is essential. Standard fuel hoses will break down over time when exposed to fuel, leading to clogging issues.
The flexibility of the hose is another key consideration. While push-on hoses are cost-effective and flexible, they are not recommended for in-car use due to their tendency to allow vapors and fumes to escape. This issue is exacerbated by the presence of ethanol in pump fuel, which can cause budget fuel hoses to deteriorate prematurely. As a result, it may be more economical in the long run to invest in R9 specification fuel hoses, which are designed to withstand ethanol and provide better value over time.
Lastly, safety regulations must be considered when choosing a flexible fuel hose. For marine applications, it is advisable to use a hose that meets the United States Coast Guard's fire resistance requirements, typically marked with "USCG" and labeled as "marine fuel hose." By adhering to these guidelines, you can ensure that your vehicle or boat remains legal and safe to operate.
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Ensuring the return line is large enough to prevent aeration
When installing a fuel line into a fuel tank, it is important to consider the size of the return line to prevent aeration. Aeration occurs when air circulates through, mixes with, or dissolves in a liquid. In the context of fuel tanks, aeration refers to the presence of air bubbles in the fuel, which can be caused by splashing or turbulence in the fuel.
To prevent aeration, it is recommended to ensure that the return line is large enough. This is because a larger return line can accommodate a higher flow rate, reducing the likelihood of splashing or turbulence that can cause air bubbles to form. Additionally, a larger return line can also provide more space for the fuel to flow back into the tank, reducing the pressure and further decreasing the chances of aeration.
One common method to prevent aeration is to run the return line from the top to the bottom of the tank, ensuring that the bottom of the tube is close to the tank bottom. This design allows the fuel to return directly to the bottom of the tank, reducing the distance that the fuel needs to travel and minimizing the chances of splashing or turbulence. By reducing the distance that the fuel needs to fall, the potential energy is reduced, leading to a lower impact force when the fuel reaches the bottom of the tank. This, in turn, helps to prevent the formation of air bubbles.
Another technique to consider is the use of a tube with slots cut along its length. By cutting slots in the tube, the fuel can disperse more evenly as it exits the return line, reducing the impact force and minimizing splashing or foaming. This method helps to slow down the velocity of the fuel, reducing the chances of aeration. Additionally, capping the end of the tube can also help to prevent splashing and reduce the formation of air bubbles.
It is worth noting that the size of the return line is not the only factor that affects aeration. The level of fuel in the tank, the presence of a tube, and the use of foam or other materials can also influence the likelihood of aeration. However, by ensuring that the return line is large enough and implementing the suggested techniques, you can effectively minimize aeration in your fuel tank.
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Keeping the fuel line away from rotating parts
It is crucial to keep the fuel line away from rotating parts when routing fuel lines in your car. This includes maintaining a safe distance from the driveshaft and the clutch, as these parts can rotate or spin unexpectedly. The term scrub line refers to the components of your car that would be affected if a tire goes flat or a wheel falls off. It is essential to keep the fuel line away from this area to prevent potential damage in such scenarios.
One effective method to achieve this is to route the fuel lines over the top of the inner fender, specifically the passenger-side inner fender. This approach not only keeps the fuel lines away from rotating parts but also helps to mitigate the negative effects of engine heat. By doing so, you can prevent issues such as vapor lock, which can occur when fuel is baked by the heat from the engine, headers, or exhaust system.
In addition to the routing strategy mentioned above, another way to keep the fuel line away from rotating parts is to ensure that it follows the frame connector toward the back of the car. Then, loop the fuel line over the top of the connector and along the inner side of the rear subframe. This approach helps to maintain a safe distance from the wheel and tyre, further reducing the risk of damage in the event of a flat tire or wheel loss.
The fuel line should then connect to bulkhead fittings at the leading edge of the gas tank. To enhance the security of the setup, consider fabricating a bracket for the tank vent line that mounts inside the driver-side rear subframe. This placement keeps the vent line elevated within the chassis, reducing the risk of interference with rotating parts.
By following these routing strategies and keeping the fuel line away from rotating parts, you can help ensure the safe and efficient operation of your vehicle's fuel system. Remember that it is essential to consider the unique characteristics of your car when making these adjustments and to prioritize the prevention of potential damage to fuel lines and other critical components. Always refer to reliable sources and seek professional guidance when in doubt.
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Securing the fuel line with clamps and ties
Securing the fuel line is a crucial step in the installation process, ensuring the safety and efficiency of your vehicle's fuel system. Here are some detailed instructions on how to secure the fuel line with clamps and ties:
Clamps:
Clamps are a reliable and secure method for fastening fuel lines. They are preferred for trouble-free recreational riding as they provide peace of mind and reduce the risk of fuel line detachment. When using clamps, it is essential to choose the appropriate type and size to ensure a secure fit. Regular hose clamps can pinch the hose and cause leaks, so proper fuel line clamps are recommended. Spring clamps are an option for ease of installation and removal, but they may not provide the same level of security as other types. Screw clamps are also an option, with brands like AWAB and ABA offering high-quality products. Oetiker clamps are another choice, but they require an additional investment in a crimp tool.
Zip Ties:
Zip ties are commonly used for racing applications as they are easy to work with and allow for quick adjustments. They are also preferred when working with plastic bailers or vent lines, where the risk of detachment is less critical. However, zip ties may not offer the same level of security as clamps, and they may need to be cut and replaced if adjustments are needed.
When deciding between clamps and zip ties, it is essential to consider the specific application and your personal preference. For a more permanent and secure solution, clamps are recommended, especially for fuel lines under pressure. On the other hand, zip ties offer convenience and ease of use, making them a popular choice for applications where frequent adjustments or replacements are expected.
Additionally, it is worth noting that some vehicles, like Yamaha's, use zip ties for their fuel lines, while others may use a combination of both clamps and zip ties, depending on the specific line being worked on. Ultimately, the decision comes down to your comfort level, the intended use of the vehicle, and any relevant safety regulations or standards that need to be adhered to.
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Routing the vent line as high as possible in the chassis
When routing a fuel line into the fuel tank, it is important to consider the placement of the vent line. The ideal placement for the vent line is as high as possible in the chassis. This setup helps to keep the fuel line away from the car's scrub line and other rotating parts such as the driveshaft or clutch. Additionally, it helps to prevent potential damage in the event of a flat tyre or wheel loss.
To achieve this, the vent line can be routed over the top of the passenger-side inner fender and then down along the outer side of the frame rail and frame connector. This ensures that the fuel line is also away from the drivetrain, including the bellhousing. The lines can then be mounted as high as possible to further prevent any scrub line interference.
It is also important to secure the vent line properly. This can be done using a combination of cushioned clamps, such as Earl's clamps, and stainless steel tie wraps (thermal locking ties). By clamping the lines at regular intervals and keeping them at the same height relative to the bottom of the subframe, the entire setup remains tight, neat, and tidy.
Another consideration is the use of a charcoal or evap canister to collect fuel vapour and prevent it from accumulating in enclosed spaces, such as a garage. This adds an extra layer of safety and can be connected to the engine's vacuum. Additionally, proper evap control is crucial to minimising fuel tank vapours and reducing fuel smells.
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Frequently asked questions
The tank should have a fitting on it. You need to screw the fitting with white sealant on it into the tank. Then you can use the quick disconnect fitting that came on the hose.
It is recommended to begin with a fuel filter. The filter should be mounted in a spot where you can easily access it. When laying out a fuel system, figure out where various components such as the fuel pump and filter(s) are mounted first. Keep the line away from rotating parts, the wheel and tire, and the scrub line on a car.
The return line should follow the pressure line back to the tank. If you are running hard lines, use flexible fuel hose to connect at the engine and the tank. This isolates vibration and movement. Return lines should return to the top of the tank, in free air space if possible.
A huge concern is heat. Another is aeration, which can be avoided by ensuring the return line is large enough.
