Rajan Wilcox
Snowmobile fuel line sizes vary depending on the make and model of the snowmobile, as well as the specific application of the fuel line. The most common fuel line sizes for snowmobiles are 1/8, 3/16, 1/4, and 5/16. Some snowmobiles may also use 3/8 fuel lines. It is important to use the correct size fuel line to ensure proper fuel flow and prevent leaks. When replacing fuel lines, it is recommended to use fuel lines specifically designed for snowmobiles or other small engines, as they need to be able to withstand fuel immersion and pressure.
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What You'll Learn
Primer lines are 1/8 ID
Primer lines for snowmobiles are 1/8" ID. This measurement is standard across different makes and models of snowmobiles. For example, the primer line for a 96 summit 670 is 1/8" ID, and the same is true for an 80 Mirage II (rotax 377) and an 80 Futura 500 (rotax 503).
The 1/8" ID primer line is also available for purchase on Amazon, sold as compatible with Kawasaki EZGO snowmobiles. This line comes in a 3.3 ft length and is made of NBR rubber. It is flexible and can fit various small engines, including those in tractors, lawn mowers, and motorcycles.
While the primer line is 1/8" ID, the fuel lines from the tank to the pump, and from the pump to the carb, are 1/4" ID. The impulse line is 5/16" ID. These lines can also be purchased on Amazon, with some kits offering multiple sizes to fit various snowmobile models.
When replacing fuel lines, it is important to consider the type of line and its compatibility with the snowmobile. For example, one source mentions that for lines constantly submerged in gas, a special type of line is needed. Another source notes that clear hoses are not rated for fuel and will swell faster, making them more prone to bursting. It is recommended to use fuel lines rated for the pressure and to check if the line is compatible with oil as well.
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Fuel lines from tank to pump are 1/4 ID
The fuel lines from the tank to the pump on a snowmobile are 1/4" ID. This is a standard size for many snowmobiles, including the 80 Mirage II (rotax 377) and the 80 Futura 500 (rotax 503). It is also the size recommended by a user on a forum for the Arctic Cat 1998 zr440 sno pro, and for the 1996 Puma.
It is important to note that there are different sizes of fuel lines used on snowmobiles. For example, primer lines are typically 1/8" ID, while impulse lines are usually 5/16" ID. The size of the fuel line can also vary depending on the make and model of the snowmobile, as well as the year it was manufactured. For instance, a user on a forum mentioned that their 1996 summit 670 had a 3/8" fuel line from the fuel tank to the shut-off and fuel pump.
When replacing fuel lines, it is essential to use lines that are specifically designed for fuel systems and are compatible with your snowmobile's engine. Standard fuel lines may not be able to withstand the pressure and can swell or burst. It is also important to consider the material of the fuel line. Some materials, such as clear or transparent lines, may not be suitable for constant immersion in fuel. It is recommended to consult a professional or refer to the manufacturer's specifications to ensure the correct size and type of fuel line is used.
Additionally, when purchasing fuel lines, it is a good idea to buy hose clamps that match the size of the lines. These clamps can help secure the lines and extend their service life.
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Impulse line is 5/16 ID
The impulse line is the line that comes off the fuel pump. It is different from a fuel line as it does not have fluid flowing through it. Instead, it alternates from pressure to vacuum, causing the diaphragm to "flutter" back and forth, which is what causes the fuel to pump.
The impulse line is usually 5/16" ID, but it can vary depending on the snowmobile model. For example, the impulse line for the 1996 Puma is 1/4" ID. It is recommended to pull the impulse line and take it to an auto parts store to find a matching hose type or a suitable alternative.
When working on the impulse line, it is important to check for any cracks or damage, as this can cause issues with the fuel pump and engine performance. If there are cracks, the line should be replaced, and the fuel pump should be inspected for any signs of damage or leaks.
To test for issues with the fuel pump, you can perform the following steps:
- Remove the fuel cap and listen for a sucking sound. If there is no sound, try blowing into the fuel vent line to prime the fuel pump.
- Open the tank, use a rag to seal it, and blow into the tank.
- If the above steps do not work, pull the spark plugs and dribble a small amount of pre-mixed gas into each cylinder.
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Fuel lines need to be rated for pressure
When it comes to snowmobiles, there are various opinions on the appropriate fuel line size. Some sources suggest that 3/16" is suitable for the in-tank line with a pickup, while others recommend 1/4" for the same purpose. The variation in recommendations may be due to differences in snowmobile models and fuel systems. It is crucial to consult the specific manual or seek advice from a dealer to ensure the correct fuel line size for your snowmobile.
Now, let's delve into the topic of fuel line pressure ratings:
Firstly, fuel lines experience pressure loss due to friction as fuel flows through them. This pressure loss can affect the performance of the fuel system, including the carburetor or fuel injection system. By using fuel lines rated for pressure, you can minimize this pressure loss and maintain the desired fuel flow rate and pressure.
Secondly, fuel lines rated for pressure provide a safety margin. While your snowmobile's fuel system may operate at a certain pressure, you want the fuel lines to be able to handle more pressure than the maximum output of the pump. This extra capacity helps prevent leaks and potential fires caused by fuel leaks. It is always better to err on the side of caution when dealing with flammable fuels.
When selecting fuel lines, consider the maximum pressure your snowmobile's fuel system can generate. Choose fuel lines with a pressure rating that exceeds this maximum pressure. For example, if your fuel system operates at 35-40 psi, consider using fuel injection-rated hoses, which are designed for higher pressure applications.
It is worth noting that fuel injection-rated hoses are becoming the new standard, and they are not as expensive as one might think. Replacing old fuel lines with fuel injection-rated hoses can provide added peace of mind and help prevent fires caused by fuel leaks. Additionally, these rated hoses often have a barrier lining that protects against ethanol fuel, which can be detrimental to regular rubber fuel lines.
In conclusion, when replacing or upgrading the fuel lines on your snowmobile, it is essential to consider both the size and pressure rating of the lines. By choosing fuel lines rated for pressure, you can ensure the safe and efficient operation of your snowmobile's fuel system, preventing leaks and potential fires. Remember to consult manuals or experts for specific recommendations regarding your snowmobile model.
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Fuel lines need to be secured with small hose clamps
Fuel lines play a critical role in snowmobiles, delivering fuel from the tank to the engine. When replacing or installing fuel lines, it's essential to ensure they are securely fastened to prevent leaks and ensure optimal performance. This is where small hose clamps come into play.
Small hose clamps are essential for securing fuel lines in snowmobiles. They provide a tight and reliable connection, ensuring that the fuel lines do not leak or become loose during operation. By applying uniform pressure around the hose, these clamps create a secure seal, preventing fuel leakage and potential hazards.
The clamps are typically made of durable materials such as stainless steel or zinc-plated carbon steel, designed to withstand the harsh conditions and temperature variations that snowmobiles often encounter. Their small size allows them to fit neatly onto the fuel lines without adding bulk or compromising the flexibility needed for installation in tight spaces.
When selecting hose clamps for a snowmobile's fuel lines, it's important to choose the right size that corresponds to the diameter of the fuel line. Common fuel line sizes found in snowmobiles include 3/16", 1/4", and 5/16" for the main lines, primer lines, and impulse lines, respectively. Using the correct clamp size ensures a proper fit and effective clamping force.
Small hose clamps for fuel lines are readily available at most home improvement stores or automotive parts retailers. They are often sold in packs, providing a convenient solution for securing multiple fuel lines or for having spares on hand for maintenance or repairs. By using these clamps, snowmobile owners can have peace of mind knowing that their fuel lines are securely fastened, reducing the risk of fuel leaks and ensuring a safer and more reliable riding experience.
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Frequently asked questions
The size of the fuel line you need depends on the year and model of your snowmobile. Primer lines are usually 1/8", fuel lines from the tank to the pump are 1/4", and impulse lines are 5/16".
Yes, there are different types of fuel lines available, including clear/transparent, solid black rubber, blue, and yellowy-orange. It is important to use a fuel line that is compatible with your snowmobile's fuel system and to consider factors such as pressure rating and material durability.
You can purchase fuel lines for your snowmobile from a variety of sources, including local dealers, auto parts stores, and online retailers like Amazon. It is recommended to bring the old fuel line or its measurements for accurate replacement.
The frequency of fuel line replacement depends on various factors, including the age and condition of the lines. It is generally recommended to inspect the fuel lines regularly and replace them if they show signs of wear, leaks, or damage. Replacing the fuel lines can improve the performance of your snowmobile and prevent potential issues.
