Sylvie Willis
The fuel line on a tractor is an important component of its fuel system. It is responsible for delivering fuel from the tank to the engine, ensuring the tractor's smooth operation. Different tractors have different fuel line setups, with some routed through the housing to protect them from damage, while others are left outside. The size of the fuel line can also vary, with some tractors using smaller lines without any issues, while others may require larger ones to ensure adequate fuel flow. In addition, the type of material used for the fuel line is important, with options including rubber, PVC, and Tygon, each with its own advantages and disadvantages.
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What You'll Learn
Fuel line size
The fuel line size for tractors is a topic that has been discussed on tractor forums. The size of the main jet must be less than the diameter of the fuel line. Most fuel lines for small engines are 1/4-inch in diameter, although some older tractors from the 1950s had 3/16-inch copper tubing. Newer fuel lines are made from a thinner material that does not have cloth strings, which means they need smaller clamps.
One user on a tractor forum noted that their tractor had a 5.5mm inner diameter fuel line, while the factory setting had a 6.5mm inner diameter. The user was concerned that the smaller diameter would restrict fuel flow, but other users reassured them that it would not be an issue. Another user shared that their tractor had a 1/4-inch outer diameter fuel line, but the actual diameter of the line was 6.3mm.
It is important to ensure that the fuel line is not too small, as this could impact the flow of fuel to the engine. However, as long as the carb bowl does not lack fuel, any line should work.
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Fuel line material
The fuel line material for tractors is an important consideration, as it needs to be durable and suitable for fuel use. Some common materials used for fuel lines in tractors and other small engines include:
- Rubber: This is a common material for fuel lines, specifically black rubber hoses. It is important to choose a hose made of rubber that is suitable for fuel and emissions use. The rubber hose should have the inside diameter printed on it, which is typically 1/4 or 3/16" for small engine fuel lines.
- Polyurethane: There are clear PVC fuel lines available, but it is important to note that PVC is not suitable for fuel use. Most clear PVC lines are actually made of polyurethane.
- Translucent Hose: Some people prefer using a greenish translucent hose as it is more flexible than clear PVC lines and allows for seeing fuel moving through it during priming. However, it may degrade faster than black rubber fuel hoses.
When replacing a fuel line, it is important to consider the routing of the hose. Some people prefer to keep the fuel lines inside the housing to protect them from damage and sagging. Others route the fuel line around the outside, allowing the inline fuel filter to dangle. Additionally, the use of a fuel filter and fuel shut-off valve can be considered for added functionality.
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Fuel filter installation
First, run the engine until it stops due to a lack of fuel. This ensures that the fuel tank is empty before you begin working on it. After the engine has stopped, wait for it to cool down completely before proceeding with any maintenance.
Now, you can begin disconnecting the fuel line from the fuel filter. Using standard pliers, squeeze the tabs on the hose clamps and slide them away from the hose ends. Then, remove the fuel line from both ends of the old fuel filter. It is important to note that some filters have a direction of flow arrow, so make sure to take note of this for the new filter installation.
Before installing the new fuel filter, it is good practice to clean the area. Shake the old filter over a clean cloth to capture any remaining fuel, and use the cloth to wipe away any residue from the outside of the filter. Additionally, wipe up any spilled fuel in the area.
Install the new fuel filter by connecting the fuel line to both ends of the new filter. Ensure that you follow the correct order, which is usually the reverse order of removal. If your filter has metal clips, be sure to reconnect them securely on both sides of the filter.
Finally, before starting the engine, check for any leaks. If fuel is leaking, stop the engine immediately, re-secure the hose and clamp, and consult a dealer or technician if needed. Refer to your operating manual for additional fuel filter maintenance and troubleshooting information.
Note: Some repairs can be hazardous, and it is recommended to consult a qualified technician if you are unsure about any steps or feel uncomfortable performing the repair.
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Fuel line routing
Firstly, it is essential to use the correct materials for fuel lines. Common sense should prevail, but some materials are not suitable for fuel lines. Copper, nylon, rubber, and plastic should be avoided. Copper, for example, can work-harden over time due to vibration, leading to cracks, especially at fittings. Modern alternatives, such as hi-tech PTFE, rubber, and stainless steel composites, are more suitable and can handle high temperatures and pressures.
When routing the fuel line, it is important to consider the path it will take from the fuel tank to the engine. Some tractor owners prefer to keep the fuel lines inside the housing to protect them from damage and potential snagging on shrubs or other obstacles. Others choose to route the lines externally, allowing the inline fuel filter to dangle freely. It is also important to secure the fuel line properly. The original fuel valves were designed to fasten to the side of the fan housing, providing a secure point for the fuel line.
The specific routing of the fuel line may vary depending on the tractor model and its configuration. For example, the fuel line may pass through the flywheel cover or behind the flywheel, as seen in some Craftsman and Simplicity snow blowers. In other cases, the fuel line may need to be routed through the blower housing, as mentioned by an OH160 tractor owner. It is always best to consult the tractor's manual or seek advice from experienced mechanics or other tractor owners for model-specific routing instructions.
Finally, it is worth noting that proper maintenance and replacement of fuel lines are crucial. Leaks can occur, and it is important to address them promptly to prevent fuel loss and potential safety hazards. When replacing fuel lines, ensure that the correct parts are used and that any bends or fittings are properly secured to prevent leaks and ensure a long-lasting solution.
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Fuel line replacement
Fuel lines on tractors can be made of metal or rubber. Over time, rubber-based hoses will need to be replaced as they succumb to weather elements and chemicals in the gasoline. Metal fuel lines can also be replaced with rubber hoses, as one user did, adding an inline fuel shut-off valve close to the gas tank. This allows them to shut off the gas at the closest point to the tank and easily empty the tank for any reason.
To replace a fuel line, first, refer to the owner's manual for the specific fuel-line hose size and the type of fuel filter. Next, remove the spark-plug wire from the spark plug. This will prevent the engine from starting while you are working. Then, remove the filling cap from the gasoline container and place it next to the tractor, near the carburetor. Now, use needle-nose pliers to grab the spring-retaining clamp that secures the rubber fuel line to the carburettor. Squeeze the two metal jaws together to loosen the spring clamp, then pull the clamp rearward onto the fuel line. Grasp the hose and pull it out of the small fitting. Place the end of the hose inside the gasoline container and allow the gas tank to empty.
Now, lay the old fuel line next to the replacement hose and trim the new fuel line to length with a knife. Locate the position of the old fuel filter on the old fuel line and cut the new fuel line in half at this point. Insert the new fuel filter into the new fuel line, using the old spring clamps from the fuel line you removed. Install the new fuel line onto the bottom of the gas tank first, then route it to the carburettor in the same path as the old one. Insert the fuel line onto the carburettor fitting.
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Frequently asked questions
You should use a hose made of rubber suitable for fuel/emissions use. The inside diameter of the hose should be 1/4 or 3/16".
Some tractors have their fuel lines running behind the flywheel, making it a pain to replace. Some people route their fuel line around the outside and let the inline fuel filter dangle.
One tip is to install a fuel filter and a fuel shut-off valve. Another is to run the fuel line through the housing to prevent it from sagging or getting snagged on shrubs.
