Sylvie Willis
Trimmer fuel lines can be confusing, especially when it comes to understanding which way they should go to the carb. The fuel lines connect the fuel tank, primer bulb, and carburetor through several holes in the choke plate. The thin line is the fuel feed, while the thick line is the fuel return/breather. When replacing the thin line, it connects to the filter inside the tank. It is important to inspect and diagram the fuel line setup before making any changes. This will help ensure that the fuel lines are connected correctly and avoid any mix-ups.
Fuel Line Characteristics and Values
| Characteristics | Values |
|---|---|
| Fuel Line Colour | Clear green-tinted |
| Replacement Cost | $4 for a spool of universal fuel line; $10 for a kit; $10 for a carburetor rebuild kit; $20-60 for a new carburetor |
| Fuel Line Setup | Connects the fuel tank, primer bulb, and carburetor through several holes in the choke plate |
| Fuel Line Installation | Pressed onto fittings by hand; pushed through grommet into the tank; pulled out through the fuel fill area |
| Fuel Line Length | Cut to length in a kit |
| Fuel Line Diameter | Must be the right diameter to function properly |
| Fuel Line Condition | May need replacement if discoloured, brittle, cracked, or if the primer bulb doesn't seal properly |
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What You'll Learn
- Fuel line kits are available for purchase and are the easiest way to replace fuel lines
- The fuel lines connect the fuel tank, primer bulb and carburetor
- The thin line is the fuel feed and the thick line is the fuel return/breather
- The fuel filter line is installed first, followed by the rest of the fuel lines
- A damaged fuel line may be discoloured, brittle or cracked
Fuel line kits are available for purchase and are the easiest way to replace fuel lines
Purchasing a fuel line kit ensures that you have all the necessary parts for a successful replacement. It eliminates the hassle of sourcing individual components, which can be time-consuming and challenging, especially for older trimmer models. With a fuel line kit, you can be confident that you have the correct fuel lines and any associated parts needed for a safe and proper installation.
Before purchasing a fuel line kit, it is important to identify your trimmer's make and model. This information is crucial for selecting the correct kit that will be compatible with your specific trimmer. You can usually find this information in the user manual or on the trimmer itself. Once you have identified your trimmer's details, you can search for compatible fuel line kits online or through authorised dealers.
Additionally, some fuel line kits may offer additional benefits, such as improved fuel efficiency or enhanced durability. It is worth considering your specific needs and preferences when selecting a kit. For example, if you plan to use your trimmer for extended periods, investing in a kit with high-quality fuel lines and durable components can be advantageous.
Overall, opting for a fuel line kit simplifies the process of replacing fuel lines in your trimmer. By providing all the necessary parts in one package, it streamlines the replacement process and ensures a correct and safe installation. With a wide range of kits available for different trimmer models, you can easily find one that suits your specific needs and helps keep your trimmer running smoothly.
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The fuel lines connect the fuel tank, primer bulb and carburetor
The fuel system in a trimmer is comprised of the fuel tank, primer bulb and carburetor, which are connected by fuel lines. The fuel lines are an integral part of the system, delivering fuel from the tank to the carburetor, where it is mixed with air before entering the engine.
The fuel lines connect the various components through holes in the choke plate, allowing them to pass between the fuel tank, primer bulb and carburetor. The specific routing of these lines can vary between different trimmer models, so it is important to consult a diagram or a professional for your specific model. For example, the Ryobi 767RJ trimmer has a specific fuel line setup, with the fuel lines passing through several holes in the choke plate.
The fuel tank will have a hole where the fuel filter attaches, and the fuel lines will enter and exit the tank through these connections. The fuel filter is usually attached to the thin fuel line, which acts as the fuel feed line. The thick line is the fuel return or breather line, and it should have a breather nipple attached to it, positioned below the fuel cap hole to prevent it from being submerged in fuel during carb priming.
The fuel lines then connect to the carburetor, with one line entering through a hole on the left side, and another line entering through a hole on the right side. The lines may connect to the carburetor via a brass fitting, depending on the model. The primer bulb is also connected to the carburetor, and the fuel lines will connect to the primer bulb base, with one line connecting to the bottom connector, and another to the small inlet connector.
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The thin line is the fuel feed and the thick line is the fuel return/breather
When working with fuel lines for a trimmer, it's important to understand the roles of the thin and thick lines. In this case, the thin line is the fuel feed, and the thick line is the fuel return or breather line. This means that the thin line is responsible for supplying fuel from the tank to the carburetor, while the thick line returns excess fuel or vapours back to the tank.
The thin fuel feed line connects directly to the fuel filter inside the tank. When installing or replacing this line, it's crucial to pull out about one inch of the fuel line from the fuel cap opening and securely attach the filter. The line should then be placed back into the tank, allowing the fuel filter and line to move freely inside. This design ensures that the fuel can be effectively drawn from the tank.
The thin fuel feed line then exits the tank and connects to the carburetor. Specifically, it attaches to the bottom connector on the carburetor. From there, a small fuel line is used to connect the top connector of the carburetor to the small inlet connector on the primer bulb base. This completes the fuel feed path from the tank to the carburetor.
Now, let's discuss the thick fuel return or breather line. This line also originates from the fuel tank and connects to the carburetor. It typically attaches to the large connector on the primer bulb base. Inside the tank, the thick line should have a breather nipple or valve attached to it. This breather component ensures that the line is not submerged in fuel when priming the carburetor. The breather valve should be positioned approximately one-quarter inch to one inch below the fuel cap hole.
When working with fuel lines, it's always a good idea to create a diagram of the line setup before making any changes. This will help you understand how the lines are routed and connected, reducing the risk of errors during installation or replacement. Additionally, it's important to ensure that the fuel lines are securely attached to their fittings. By following these steps and understanding the roles of the thin and thick lines, you can confidently work with the fuel lines of your trimmer.
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The fuel filter line is installed first, followed by the rest of the fuel lines
When replacing trimmer fuel lines, it is important to first inspect and diagram the existing fuel line setup to ensure a smooth repair process. The fuel filter line should be installed first, followed by the remaining fuel lines.
The fuel lines of the trimmer connect the fuel tank, primer bulb, and carburetor through several holes in the choke plate. The fuel filter attaches to a specific hole in the fuel tank, and the filtered "in" line passes from the tank through a hole in the choke plate to the carburetor.
It is recommended to draw a diagram of the fuel line arrangement to prevent any mix-ups during the installation process. This diagram will serve as a reference when threading each line through the correct holes and attaching them to the appropriate places on the trimmer.
After installing the fuel filter line, the remaining fuel lines can be pressed onto their fittings by hand. Ensure that they are pressed firmly onto the fittings to hold tightly. Refer to your diagram to confirm that the new fuel lines are installed correctly before reassembling the trimmer.
By following these steps and paying close attention to the fuel line connections, you can successfully replace the trimmer fuel lines, ensuring proper fuel flow and optimal performance from your equipment.
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A damaged fuel line may be discoloured, brittle or cracked
A damaged fuel line can cause serious issues for your vehicle, so it's important to be able to spot the signs of damage. A damaged fuel line may be discoloured, brittle, or cracked, and these signs of wear and tear can eventually lead to fuel leaks. Fuel leaks are dangerous and can cause your vehicle to come to a full stop.
Fuel lines are rubber hoses that connect the fuel tank to the carburetor, and they are designed to withstand the high pressure of fuel injection systems. However, they will degrade over time and can be damaged by corrosion, age, and abrasion. Corrosion is a common cause of fuel line damage, especially in older vehicles or those exposed to harsh environments. The metal parts of the fuel lines are particularly susceptible to corrosion, and the soft, flexible hose parts are more prone to cracking if they become soaked in gas.
A damaged fuel line will usually produce some symptoms that indicate a potential problem. One of the earliest signs is often the smell of gasoline inside the vehicle. This is caused by fuel escaping from the fuel line, and it can be very strong and distinct. You may also notice a hissing sound when the engine is idle or has just been turned off, and this can be accompanied by a drop in fuel efficiency as the fuel system loses pressure.
If your vehicle is struggling to start, idling roughly, or losing power, these could also be signs of fuel line damage. In more serious cases, you may notice puddles of fuel under your vehicle, or even spraying from a leak while the vehicle is in motion. These are obvious signs of a damaged fuel line and should be addressed as soon as possible.
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Frequently asked questions
Your fuel line may need replacing if it has discoloured, become brittle, or has visible cracks. You may also notice a faulty seal on the primer bulb and an increase in air when trying to prime the trimmer.
First, remove the fuel tank, carburetor plate, and carburetor. Then, draw a diagram of the fuel line setup, noting the placement of the fuel filter and the route of the fuel lines. When installing the new fuel lines, ensure they are pressed onto their fittings tightly and follow your diagram to thread each line through the correct holes.
First, adjust the low adjustment screw until the trimmer can run without dying out. Then, adjust the high adjustment screw until you reach the desired running speed while holding the throttle open. Note that you may need a special tool to adjust the carb as a regular flat-head screwdriver may not work.
The thick fuel line is the fuel return/breather line, while the thin fuel line is the fuel feed line.
