Ameer Randolph
A fuel tank breather is a system that allows a fuel tank to breathe. It is necessary to relieve both vacuum and pressure. Gasoline expands in volume as it warms up and shrinks in volume as it cools down, causing the fuel level in the tank to fluctuate throughout the day, even if the vehicle is not in use. One way to create a fuel tank breather is to hook up a long piece of clear plastic tubing to the nipple on the fuel filler neck and route the tube down to a hole in the floor below the spare tire, providing a vent for gas fumes to escape.
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What You'll Learn
Remove the old venting system
To remove the old venting system, start by locating the venting components, which may include a plastic fuel bar, vent lines, and a charcoal vapour canister. It is important to identify all the parts of the old system to ensure a thorough removal.
Next, carefully detach and remove all the components of the old venting system. This may involve some disassembly of the vehicle to access the parts. Be sure to have a plan to catch any fuel or vapours that may be released during the removal process, as there may be fuel trapped in the lines. Be cautious when handling the old system, as some parts may be brittle or damaged.
The process may vary depending on the specific vehicle and venting system. For example, some systems may have a plastic pressure tube that needs to be removed, as mentioned in one source. Identify and address all components to ensure a complete removal.
In some cases, you may need to remove the fuel tank itself to access and remove all the old venting components. This can be a more involved process and may require additional tools and expertise. It is important to refer to vehicle-specific instructions or consult a mechanic if you are unsure about any aspect of the removal process.
Once all the old venting system components have been removed, you can prepare to install the new fuel tank breather system. Ensure that the area is clean and free of any debris or residue left over from the old system. With a well-executed removal, you will have a good foundation for installing the new venting system.
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Attach a hose to the tank vent
To make a fuel tank breather, you need to attach a hose to the tank vent. This hose will act as a vent for gas fumes, allowing them to escape from the tank and be routed away from the vehicle's interior. It is important to note that the hose should be attached to the vent nipple on the fuel filler neck, and the end of the hose should be routed to a hole located below the spare tire or to the back of the car. This ensures that the fumes are vented outside and do not enter the vehicle's cabin.
When attaching the hose to the tank vent, it is crucial to use a hose that is long enough to reach the desired venting location. The hose should also be made of a material that is compatible with gasoline, such as clear plastic tubing or rubber hose. It is important to secure the hose properly to prevent it from coming loose and ensure that it is routed higher than the highest point on the tank, including the fuel filler neck. This prevents fuel from splashing out when the vehicle is in motion.
Additionally, the vent line should not have any dips or low points where fuel or condensation can collect. This can cause blockages and affect the performance of the breather system. It is recommended to use a vent or a filter at the end of the hose to prevent water, dirt, and debris from entering the tank. This can be achieved by using a vent from a truck axle or a lawnmower fuel filter, depending on the hose material.
It is worth noting that some gas tanks, particularly those designed as closed systems for evaporative emissions, may not have readily available vented gas caps. In such cases, attaching a hose to one of the tank vents and running it as high as possible is a common solution. This modification allows the tank to breathe and relieves both vacuum and pressure. By following these steps and considerations, you can effectively attach a hose to the tank vent to create a functional fuel tank breather system.
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Run the hose as high as possible
When designing a fuel tank breather system, it is important to consider the routing of the vent hose and to run it as high as possible. This is a crucial aspect of the system's functionality and longevity. By running the hose upwards, you can effectively prevent fuel from potentially spilling out through the vent in the event of a tip-over or rollover. This is especially critical in off-road vehicles, boats that experience heavy rocking, or any application where the fuel tank may be subjected to unusual angles or rapid movements.
Routing the hose upwards also helps to minimize the amount of dust, debris, and water that can enter the fuel tank. With the hose elevated, the chances of these contaminants reaching the tank are reduced, as they are less likely to overcome the force of gravity and travel upwards. This simple measure can significantly reduce the risk of fuel contamination, which could lead to engine issues and costly repairs.
In addition, positioning the hose higher creates a natural barrier to fuel theft. The elevated hose makes it more challenging for thieves to access the fuel, requiring them to climb higher or use specialized tools to reach the vent, thus acting as a deterrent. This simple design choice can provide an extra layer of security and peace of mind.
Furthermore, the elevated hose can assist in maintaining proper fuel flow and ventilation. By creating a vertical rise in the hose, you promote the separation of air and fuel vapors from liquid fuel. This separation improves ventilation and helps maintain a consistent fuel flow rate, ensuring the engine receives the necessary fuel for optimal performance.
Finally, consider the overall layout of the vehicle or vessel when running the hose upwards. The path should be smooth and free of sharp bends or kinks that could restrict airflow or fuel vapor movement. Utilize hose clamps and supports to securely fasten the hose and maintain the proper elevation. This careful routing ensures the breather system functions effectively without placing unnecessary strain on the hose or connections.
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Use a rubber hose with a fuel filter
A fuel tank breather is a device that allows fuel in the tank to escape without causing a fire. It is usually made up of a valve and a filter. The valve opens when the fuel level in the tank decreases, allowing air to enter and exit and preventing pressure build-up, which could lead to leaks. The filter traps large particles such as rust and metal shavings, preventing them from entering the engine.
When using a rubber hose with a fuel filter to create a fuel tank breather, it is important to ensure that the hose is securely attached to avoid fuel leakage. The rubber hose should be correctly aligned and properly secured for the safe and efficient functioning of the breather system. A grommet can be used to securely attach the hose, acting as a protective barrier against debris and moisture.
The length of the rubber hose should also be considered. Excessively long hoses can contribute to the creation of a vacuum or pressure build-up. The hose should be installed without bends or kinks, as this can lead to condensation and attract insects. It is also important to ensure that the hose is free of blockages, as this is a common cause of a fuel tank breather not working properly.
The fuel filter plays a crucial role in the effectiveness of the fuel tank breather. It should be regularly inspected and maintained to prevent clogging. The filter traps dirt, debris, and contaminants, which can accumulate over time and hinder proper airflow. A clogged filter can cause similar symptoms to a faulty breather, including the vehicle stalling, so it is important to check the filter first when troubleshooting.
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Vent to the rear of the car
When venting a fuel tank, one option is to vent it to the rear of the car. This can be achieved by following these steps:
Firstly, you will need to purchase or fabricate a vent hose that is long enough to reach from the fuel tank to the rear of the car. The hose should be made of a material that is compatible with fuel, such as rubber or synthetic rubber, and it should be clamped securely at both ends to prevent leaks.
Next, you will need to decide on the vent location at the rear of the car. A common practice is to vent the fuel tank near the rear bumper, often utilising an existing hole or cut-out in the body work. Choose a location that allows for a straightforward hose routing and ensures that the vent outlet is not obstructed. Drill or cut a hole of an appropriate size, being mindful of maintaining the structural integrity of the car body.
Then, you will need to connect one end of the vent hose securely to the fuel tank. This typically involves removing the fuel tank cap or accessing the filler neck area to attach the hose to the vent outlet on the tank. Ensure that the connection is airtight to prevent fuel vapour leaks and that the hose is securely fastened along the entire route to the rear of the car.
After that, route the hose along the chassis or through designated channels, ensuring it is securely fastened and protected from potential damage or abrasion. Use suitable clamps or cable ties to hold the hose in place, following the vehicle's existing wiring or hose routing as a guide.
Finally, once the hose reaches the chosen vent location at the rear of the car, cut the hose to the appropriate length, ensuring a snug fit, and secure it in place with a suitable hose clamp. Position the vent outlet to minimise the risk of fuel vapours being drawn into the vehicle's interior and ensure it complies with safety regulations.
By following these steps, you can effectively vent your fuel tank to the rear of the car, ensuring proper ventilation and preventing fuel vapour accumulation in the engine bay or vehicle interior. Regularly inspect the vent hose for damage or leaks to maintain system integrity and safety.
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Frequently asked questions
Your tank needs to breathe. It needs a vent to relieve vacuum and pressure. Gasoline expands in volume as it warms up and shrinks as it cools down, so the fuel level changes throughout the day, even if you're not driving.
Attach a hose to one of the tank vents and run it as high up as possible. You can use a rubber hose with a lawnmower fuel filter to keep out dust and dirt.
The line must be higher than the highest point on the tank, including the fuel filler neck. The vent line cannot have a dip in it where fuel or condensation can get trapped.
If fuel becomes trapped, the tank will build pressure or a vacuum until there is enough pressure to purge the vent, causing gas or odour to come from the vent line. If enough pressure builds up, it could damage your tank.
You can hook a long piece of clear plastic tubing to the nipple on your fuel filler neck and route the end of the tube down to the floor hole below your spare tire to vent the gas fumes outside.
