Regan Brown
Installing a fuel tank vent valve is a complex process that requires careful attention to detail. The purpose of a fuel tank vent valve is to allow air to be released from the tank, preventing pressure build-up and vacuum situations. This is essential as fuel levels in a tank fluctuate throughout the day, and the tank must breathe. The vent valve also plays a critical role in preventing fuel from escaping through the vent line during an accident. When installing a fuel tank vent valve, it is crucial to ensure that the valve is mounted vertically and above the fuel level, as incorrect mounting can lead to vent blockage and potential damage to the tank. While some opt for factory venting systems, others choose aftermarket solutions, such as the Tanks Inc. rollover vent valve, which has gained recognition in the industry.
Characteristics and Values of Installing a Fuel Tank Vent Valve
| Characteristics | Values |
|---|---|
| Vent Line Position | Should be the highest point on the tank system, including the fuel filler neck |
| Vent Line Angle | Should be mounted vertically, not at an angle or horizontally |
| Vent Line Trap | Avoid creating a trap in the vent line between the tank and vent valve |
| Vent Valve Angle | Should be mounted vertically, not on its side or upside down |
| Rollover Vent Valve Function | Allows air to be released, preventing pressure build-up and vacuum during normal operation |
| Remote-Mount Rollover Valve | Can be used when there is no room to install an in-tank valve |
| In-Tank Valve | Prevents fuel from draining out through the vent line during accidents |
| Repairing a Broken Vent Valve | Cut the ring of the old valve, remove the tension ring and o-ring from the new valve, insert the new valve, seal with epoxy, cut the nipple of the old valve, insert into the hose |
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What You'll Learn
Ensure the vent is mounted vertically, not at an angle
It is imperative that the vent is mounted vertically and not at an angle. This is because, if the vent is mounted at an angle or horizontally, it will always be shut, and your tank will not be properly vented. The vent must be higher than the highest point on the tank, including the fuel filler neck. This is to ensure that the tank can breathe and does not build up pressure or a vacuum during normal operation.
As fuel is added to your tank, the air inside the tank is displaced and needs to escape. Similarly, as fuel is drawn from the tank, the vent lines and valves allow air to return to the tank, preventing a vacuum situation. If the vent is mounted at an angle, the vent may shut off, and the pressure could damage your tank.
Additionally, when routing the vent line from the tank to the vent valve, avoid creating a trap within the line. This means that the vent line should not run down and then back up again, as this could cause fuel or condensation to become trapped.
By following these guidelines and ensuring the vent is mounted vertically, you can guarantee the proper functioning of your fuel tank vent valve and maintain the health of your tank.
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Position the vent above the fuel level
It is imperative that the vent is positioned above the fuel level. This is because the fuel level of your tank changes throughout the day, even if you are not driving it. Gasoline expands in volume as it warms up and shrinks in volume as it cools down. Therefore, your tank must have a vent that will relieve both vacuum and pressure.
If you are running a vent line, it is important that the line is run higher than the highest point on the tank, including the fuel filler neck. This is to ensure that the vent line is always above the fuel level. If the vent line is not positioned above the fuel level, fuel could get pushed up the vent line and get trapped, causing the tank to build pressure or a vacuum. This could lead to dangerous conditions such as tank bulging, fuel line leaks, fuel pump problems, insufficient fuel to the engine, or potential fire hazards when opening the filler cap.
Additionally, the vent line cannot have a dip in it where fuel or condensation can get trapped in the line. This means avoiding running the vent line down and then back up again, as this will create a trap for condensation or fuel. Instead, the vent line should be run straight up, with the vent valve mounted vertically. In the case of a remote rollover vent, this means that the hose barb should be facing down with the aluminium cylinder sitting on top.
By positioning the vent above the fuel level and ensuring that the vent line is free of dips or traps, you can help ensure that your tank is properly vented and avoid potential issues caused by built-up pressure or a vacuum.
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Avoid creating a trap within the vent line
The vent line is an important component of a fuel tank. It allows air to be released so that pressure does not build up and also permits air to return to the tank so that a vacuum situation is avoided.
However, the vent line cannot have a dip in it where fuel or condensation can get trapped in the line. If fuel becomes trapped in the line, your tank will build pressure or vacuum until there is enough pressure to purge the vent, which will cause gas and/or odor to come from the vent line. If enough pressure builds up, damage could be caused to your tank.
Therefore, when routing the vent line from the tank to the vent valve, it is imperative to avoid running the vent line down and then back up again. This is because, like a P-trap under a sink, this is a place where condensation or fuel can become trapped in the line.
To avoid creating a trap within the vent line, the vent line should be the highest point in your tank system. This means that the vent must be higher than the highest point on the tank, including the fuel filler neck.
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Remove the tension ring and o-ring from the new part before inserting it
To install a new fuel tank vent valve, you need to remove the tension ring and o-ring from the new part before inserting it. This is a crucial step to ensure a proper seal and secure fit for the new valve. Here's a detailed guide on how to do this:
First, identify the tension ring and o-ring on the new vent valve part. The tension ring is typically a circular or ring-shaped component that applies pressure to hold the valve in place, while the o-ring is a round sealing gasket made of rubber or plastic. Both of these components are essential for creating a tight seal and preventing leaks.
Next, carefully remove the tension ring. It may be held in place with clamps, screws, or other fasteners. Use the appropriate tools to loosen and remove these fasteners without damaging the tension ring or the surrounding parts. Once removed, set the tension ring aside in a safe place to avoid misplacing it.
Now, focus on the o-ring. O-rings are designed to create a tight seal, so they can be a bit tricky to remove. Use a flat-head screwdriver or a similar tool to carefully pry and lift the o-ring out of its groove without damaging the gasket or the surrounding surfaces. Again, set the o-ring aside in a safe place to ensure you don't lose it.
After removing both the tension ring and the o-ring, inspect the new part and the old valve housing to ensure there is no debris or damage that could hinder the installation or sealing process. It's important to have a clean and smooth surface for the new valve to sit properly.
Finally, you are now ready to insert the new fuel tank vent valve into the old valve housing. Follow the subsequent steps in your installation guide, which may include sealing the new valve in place with epoxy or another suitable adhesive, ensuring proper alignment, and allowing adequate curing time for a strong bond.
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Seal with epoxy and cut the nipple off the old valve
When installing a fuel tank vent valve, you may need to seal with epoxy and cut the nipple off the old valve. This process can be done when repairing a broken vent valve, and it is important to use the right epoxy for the job. Firstly, ensure you have removed the tension ring and o-ring from the new part before inserting it. Then, apply a gasoline-resistant epoxy, such as a 4000 PSI epoxy made by Super Glue, to seal the new valve in place.
Before the epoxy sets, make sure the nipple is pointed between the two dashes on the tank, so it will line up with the hose. Once the epoxy has set, cut the nipple off the old vent valve. You can then insert the cut side of the nipple into the hose, ensuring you leave enough space for the locking clip on the fitting. This method will result in a stronger and better-sealed connection than the original.
It is important to use the correct type of epoxy for this repair. A two-part epoxy designed for sealing aircraft fuel tanks has been recommended, as well as JB Weld epoxy. It is also recommended to avoid using silicone, as it will dissolve in gasoline.
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Frequently asked questions
A fuel tank vent valve is a device that allows air to be released from the tank so that pressure does not build up. It also lets air return to the tank as fuel is drawn out, to avoid a vacuum situation.
Firstly, ensure the vent is mounted vertically. If it is mounted at an angle or horizontally, the vent will shut off and your tank will not be properly vented. Make sure the vent line is higher than the highest point on the tank, including the fuel filler neck.
One common mistake is mounting the valve too low, or at an incorrect angle. Another is creating a trap within the vent line between the tank and the vent valve, where condensation or fuel can get trapped.
An in-tank valve performs the same function as its remote-mount counterpart, but a remote-mount valve can be used when there is no room for an in-tank valve.
You can try to glue the valve back together, or cut the ring with a razor knife and replace it with a universal vent valve.
