Sylvie Willis
Poly fuel lines are a popular choice for lawn mowers, but there are several factors to consider when selecting the right fuel line for your machine. The inner diameter of the fuel line is important, as it needs to be large enough to supply sufficient fuel without restricting flow, but not so large that it causes leakage. The material of the fuel line is also a key consideration, with options including rubber, polyurethane, and polyvinyl chloride (PVC). Each material has its own advantages and disadvantages in terms of durability, flexibility, and resistance to oil, ethanol, and high pressure. Additionally, the inclusion of an inline fuel filter can help maintain the engine's performance by preventing debris from entering the carburetor, although it may affect the flow rate of fuel.
Fuel lines for lawn mowers
| Characteristics | Values |
|---|---|
| Fuel line material | Polyurethane, Poly, PVC, Tygon, Rubber, PTFE |
| Fuel line inner diameter | 1/4", 3/16" |
| Fuel type | Gasoline, Ethanol |
| Fuel delivery | Gravity feed, Fuel pump |
| Fuel filter | Inline filter, Paper type filter, Screen filter |
| Fuel line maintenance | Cleaning, Replacement |
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What You'll Learn
Urethane vs. black rubber fuel lines
Polyurethane fuel lines are a popular choice for those looking to replace their fuel lines. They are often marketed as a durable and flexible option that is resistant to collapsing and fuel additives. However, some people prefer to stick with the traditional black rubber fuel lines, especially for larger equipment.
Urethane fuel lines are typically found on smaller gas engines like weed wackers and chainsaws. They are made from polyurethane, a type of plastic, and are often translucent. While they may seem like an appealing option for larger motors like lawn mowers due to their flexibility and resistance to ethanol, they have some drawbacks. Urethane fuel lines have been known to break down and fall apart over time, usually within a few years. Additionally, they may not handle as much pressure as black rubber fuel lines, especially in systems with a fuel pump.
On the other hand, black rubber fuel lines have been a trusted option for many years. While they may dry out and crack over time, especially with exposure to high temperatures and sunlight, they are generally long-lasting and can be replaced as needed. Black rubber fuel lines are suitable for fuel and emissions use and are compatible with gasoline. They are also available in different sizes, typically with an inside diameter of 1/4 or 3/16 inches.
When choosing between urethane and black rubber fuel lines, it's important to consider the specific application and engine type. For small engines without a fuel pump, urethane fuel lines may be sufficient. However, for larger engines or those with a fuel pump, black rubber fuel lines might be a more durable and reliable option. It's also worth noting that proper fuel storage habits and regular maintenance can help extend the lifespan of any fuel line.
Some alternative options to consider are the R14 spec hose, which offers a balance between stiffness and flexibility, and the UltraPro PTFE fuel line by Holley, which is suitable for high-performance engines and has advantages over rubber fuel lines in terms of ageing and vapour containment. Tygon fuel lines are also mentioned as a durable and flexible option, although they may not be suitable for all applications as they cannot have any reinforcement mesh. Ultimately, the best choice depends on individual needs and preferences, and it may be worth consulting with a lawnmower repair shop or mechanic for specific recommendations.
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Fuel line ID in small engines
The inner diameter (ID) of a fuel line is an important consideration when choosing a replacement for small engines. The ID of a fuel line can impact the flow of fuel to the engine, and while a larger ID can be used if the original size is unavailable, it is important to ensure that the fittings are tight enough to prevent fuel leakage.
Small engine fuel lines typically have an inside diameter of 1/4 or 3/16 inches, although some older engines may have smaller IDs of around 1/8 inch. It is important to ensure that the fuel line you choose is compatible with your specific engine and fuel type. For example, clear PVC lines are commonly used for small engines, but they may not be suitable for high-pressure fuel systems.
When selecting a fuel line for a small engine, it is also important to consider the material. Common materials include rubber, polyurethane, and PVC. Rubber fuel lines are suitable for fuel and emissions use, but they can dry out, crack, and deteriorate over time, especially with exposure to ethanol and sunlight. Polyurethane fuel lines are commonly used in very small gas engines, such as weed wackers and chainsaws, but they may not be ideal for larger engines like lawn mowers due to their lower pressure handling capabilities. PVC fuel lines are flexible and easy to work with, but they may not be suitable for all fuel types.
It is also worth noting that some fuel lines are reinforced with materials like nylon, which can improve their durability and cut resistance. Additionally, the flexibility of a fuel line can impact its ease of installation, especially in tight or awkward areas.
Overall, when selecting a fuel line for a small engine, it is important to consider the ID, material, flexibility, and compatibility with your specific engine and fuel type.
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Inline fuel filters for small push mowers
Most small push mowers do not have fuel filters. They do, however, have a screen inside the tank that only stops larger debris such as grains of sand. This can be insufficient, as smaller particles can clog up the jet. Inline fuel filters can be purchased for a low price and are safe to use with small push mowers. They are designed to allow fuel flow and will not interfere with the pressure.
When installing an inline fuel filter, it is important to ensure that it is compatible with your engine. Engines with fuel pumps require filters that can tolerate 40 microns or less, whereas engines without fuel pumps need filters that can filter to 75 microns or more. Installing the wrong type of filter can cause fuel delivery issues. Additionally, care should be taken to place the filter correctly so that it does not interfere with throttle mechanisms or touch the engine itself.
The orientation of the filter is also important. The larger diameter side of the paper filter should be placed furthest from the gas tank, as this is where the fuel enters. The filter paper is often cylindrical and attached to one side of the plastic housing, with empty space on the other side. This empty space is where the fuel enters.
There are a variety of materials used for fuel lines, each with its own advantages and disadvantages. Black rubber fuel lines are common in larger equipment but tend to dry out and crack over time. Urethane fuel lines are found in smaller gas engines but break down and fall apart faster than rubber. They are also less suitable for systems with fuel pumps as they cannot handle as much pressure. Polyurethane fuel lines are clear and flexible, but they are not suitable for high-pressure fuel systems. PTFE stainless braided fuel lines are an option for high-performance engines and offer advantages over rubber, as they do not deteriorate and create issues with hardening and brittleness.
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Signs of a clogged fuel line
Polyurethane fuel lines are commonly used in lawn mowers. However, it is important to be aware of the signs of a clogged fuel line to ensure proper maintenance and prevent long-term damage. Here are some signs that your lawn mower's fuel line may be clogged:
- The engine sputters and spits out excessive black smoke while running.
- The lawn mower runs but has difficulty starting and may stall out at half a tank.
- Uneven idling or choking of the engine.
- The mower may run for a short period, then suddenly stop as if it ran out of gas.
If you notice any of these signs, it is important to address the issue promptly. You can try to unclog the fuel line by following these steps:
- Put on safety glasses to protect your eyes from any fuel spray.
- Disconnect the spark plug to prevent accidental engine startup during the process.
- Unscrew the cap to the fuel tank and inspect for any sealants or plastics that may be causing blockage.
- If there is a visible object causing the clog, carefully remove it. If not, proceed to drain the fuel from the tank.
- Check for a screen over the outlet to the fuel line and replace it if blocked.
- Locate the fuel filter and consider replacing it if the blockage cannot be easily cleared.
- Place your hand at the tank and blow through it to ensure airflow.
If these steps do not resolve the issue, it is recommended to contact a professional for further assistance.
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Recommended fuel line materials
When choosing a fuel line for your lawnmower, it is important to select one made of durable materials that are resistant to gasoline and ethanol. The fuel line should be replaced every 3-5 years or sooner if there are signs of damage or wear. Some common materials used for fuel lines include:
- Rubber – A common material for fuel lines in lawn mowers and other small engines is rubber. It is important to choose a hose made of rubber suitable for fuel/emissions use. This information should be printed on the hose. Black rubber fuel lines can dry out and crack over time, especially with the addition of ethanol to gasoline. However, rubber fuel lines can handle more pressure compared to some other materials.
- Polyurethane – Clear PVC fuel lines are commonly available, but many of these are actually made of polyurethane. These lines are flexible and oil and ethanol resistant. However, they are not suitable for high-pressure fuel systems.
- PTFE – PTFE fuel lines, such as the UltraPro PTFE fuel line by Holley, are a good option for high-performance engines with higher pressure. They do not "breathe" as they age and contain any vapors. PTFE lines are more durable than rubber and do not deteriorate and become hard and brittle.
When replacing the fuel line, it is important to choose one that is the correct size for your lawn mower engine. The fuel line size is usually indicated on the fuel line itself, or you can refer to the owner's manual or engine specifications.
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Frequently asked questions
Polyurethane fuel lines are not the best option for lawn mowers. They are more prone to breaking down and falling apart over time and cannot handle as much pressure as rubber fuel lines. It is recommended to use a black rubber fuel line for lawn mowers, as they are more durable and better equipped to handle fuel pumps.
Rubber fuel lines are more durable and long-lasting compared to polyurethane, which tends to break down over time. Rubber lines can also handle higher pressure, making them suitable for lawn mowers with fuel pumps. Additionally, rubber fuel lines do not have the same issues with reinforcement mesh as polyurethane lines, which can be challenging to manufacture for smaller engines.
Yes, PTFE fuel lines are another option for lawn mowers. PTFE lines have the advantage of not "breathing," meaning they contain vapors better than rubber lines. They also tend to age better and are less likely to suffer from hardening and brittleness issues that rubber lines may experience over time.
