Mercedes Mullins
Replacing a fuel tank vent is a complex process that requires careful attention to detail. It involves removing the fuel lines, filter, and vent from the fuel tank, as well as disconnecting lines connected to the carburetor. It is important to note the position of the lines from the carburettor before removing them. The old vent is then replaced with a new one, and the fuel lines are reinserted into the fuel tank.
| Characteristics | Values |
|---|---|
| Removing the old fuel tank vent | Disconnect the fuel lines from the air purge body assembly, remove the purge bulb retainer, and pry out the fuel line grommet from the fuel tank |
| Installing the new fuel tank vent | Insert the new fuel line, fuel vent line, and fuel return lines into a new fuel line grommet, carefully push the new grommet into the fuel tank opening, and insert the fuel tank vent into the vent line |
| Additional steps | Remove and replace the air filter cover and spark plug, gap the new spark plug at 0.025, and change out the air purge body assembly as a precaution |
| Common issues | Rubber fuel line and grommet may be dissolved, requiring replacement |
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What You'll Learn
Removing the old fuel tank vent
The first step is to disconnect the fuel lines from the carburettor. This may involve removing screws or prying out components with a screwdriver, as in the case of the fuel line grommet. It is important to note the position of the fuel lines from the carburettor before removing them, as this will make replacement easier.
Once the fuel lines have been disconnected, the next step is to remove the fuel tank itself. This may require loosening screws or other fasteners holding the tank in place. With the tank removed, the old fuel tank vent can be accessed and replaced.
Before installing the new vent, it is important to clean the tank and ensure that all old components, such as the fuel filter and fuel lines, are also replaced. This will help ensure the proper functioning of the new vent and prevent any potential issues down the line.
In some cases, it may be necessary to create a new hole for the vent. This can be done with a rasp, carefully enlarging the hole to accommodate the new vent valve. It is important to ensure that the new vent is properly sealed and that the nipple is correctly aligned with the hose.
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Disconnecting the fuel lines
To disconnect the fuel lines, you will need to remove the fuel tank from the machine. You can do this by loosening the screws holding the handle and removing the fuel tank from the machine. Once the fuel tank is removed, you can then remove the fuel lines, filter and vent from the fuel tank.
It is important to note the position of the lines from the carb before removing them. Taking close-up pictures of everything before you start can make the replacement process easier.
You can then remove the fuel line grommet from the fuel tank by prying it out with a screwdriver. Insert the new fuel line, fuel vent line, and fuel return lines into the new fuel line grommet. Use a screwdriver to carefully push the new grommet with the lines into the opening of the fuel tank.
Finally, insert the fuel tank vent into the vent line. As a precaution, you may want to change out the air purge body assembly.
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Replacing the fuel filter
At this point, you can install a new fuel filter. Make sure to note the position of the fuel lines from the carburettor, as this will make replacement easier. Once the new filter is in place, you can reinsert the fuel tank into the machine and reconnect the fuel lines.
It is also recommended to change out the air purge body assembly as a precaution. To do this, remove the purge bulb retainer and fuel line grommet from the fuel tank. Insert a new fuel line, fuel vent line, and fuel return lines into a new fuel line grommet. Carefully push the new grommet with the lines into the fuel tank using a screwdriver. Finally, insert the fuel tank vent into the vent line.
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Inserting the new fuel vent line
To insert the new fuel vent line, you will need to have already removed the fuel lines from the air purge body assembly and the purge bulb retainer. You will also need to have removed the fuel line grommet from the fuel tank.
Next, insert the new fuel line, fuel vent line, and fuel return lines into the new fuel line grommet. Then, carefully use a screwdriver to push the new grommet with the lines into the opening in the fuel tank.
Now, insert the fuel tank vent into the vent line. You may want to change out the air purge body assembly as a precaution.
Finally, make sure the nipple is pointing in between the two dashes on the tank so it will line up with the hose.
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Sealing the new vent valve
Before you start sealing the new vent valve, make sure you have removed the tension ring and o-ring from the new part. You can then take the new vent valve part and press it into the old base until it snaps in and is tight.
To seal the new vent valve, you will need some 4000 PSI epoxy. This can be purchased from Super Glue. Make sure the nipple is pointing in between the two dashes on the tank so that it will line up with the hose.
Apply the epoxy to the new vent valve, ensuring that it is completely covered. You may need to use a small brush to get into any small crevices. Once the epoxy is applied, allow it to dry completely before reassembling the fuel tank.
It is important to follow the manufacturer's instructions when using epoxy, as it can be hazardous if not used properly. Be sure to work in a well-ventilated area and wear protective gear, such as gloves and eye protection.
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Frequently asked questions
Remove the fuel lines from the air purge body assembly, then remove the purge bulb retainer. You can then remove the fuel line grommet from the fuel tank by prying it out with a screwdriver.
Insert the new fuel line, fuel vent line, and fuel return lines in the new fuel line grommet. Insert the new grommet with the lines into the fuel tank by carefully using a screwdriver to push the grommet into the opening. Then insert the fuel tank vent into the vent line.
It is recommended to change out the air purge body assembly as a precaution. You should also replace the fuel filter, spark plug, and air filter cover.
You will need a screwdriver and a new fuel tank vent.
Disconnect the two lines connected to the carburetor. Loosen the screws holding the handle and remove the fuel tank. Remove all the fuel lines, filter and vent from the fuel tank and replace all of the components.
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