
Transmission oil cooler lines and fuel lines are two different types of hoses. While transmission oil cooler lines are made to withstand the heat and chemicals in transmission fluid, fuel lines are designed for gasoline. As a result, using a fuel line as a transmission oil cooler line can lead to a ruptured line. However, some people have used fuel lines as a quick fix for transmission oil cooler lines, but this is not recommended as a long-term solution.
| Characteristics | Values |
|---|---|
| Safety | Using a fuel line hose for transmission oil is not recommended in the long term. |
| Cost | Fuel line hose is cheaper than transmission oil cooler hose. |
| Pressure | Fuel line hose has a working pressure of 15 bar (220 psi) and a burst pressure of 60 bar. |
| Durability | Transmission oil cooler hose is thicker, stiffer, and more durable. |
| Compatibility | Fuel line hose may not be compatible with transmission oil in the long term due to differences in solvent characteristics and operating temperature. |
| Leakage | Fuel line hose is prone to leakage due to softening caused by heat and oil. |
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What You'll Learn

Fuel line hoses are cheaper than transmission cooler hoses
Fuel line hoses are designed to withstand the pressure of fuel and control fumes. Transmission cooler hoses, on the other hand, are reinforced to withstand higher pressure, heat, and the chemicals in transmission fluid, which can cause regular fuel line hoses to swell, soften, and rupture.
Transmission cooler hoses are made of thicker and stiffer material, which is why they are more expensive than fuel line hoses. Fuel line hoses are typically rated at 250 psi, while transmission cooler hoses are rated at 1000 psi. This means that transmission cooler hoses can withstand much higher pressures than fuel line hoses.
While it is possible to use a fuel line hose as a transmission cooler hose in a pinch, it is not recommended as a long-term solution. Fuel line hoses are not designed to withstand the same pressures and temperatures as transmission cooler hoses and may not last as long. In addition, the chemicals in transmission fluid can cause the fuel line hose to degrade over time, leading to leaks and potential safety hazards.
Some people may choose to use fuel line hoses for transmission fluid because they are more readily available and less expensive. However, it is important to consider the potential risks and consequences of using an incorrect hose. It is always best to use the proper type of hose for the specific application to ensure safety and longevity.
In summary, while fuel line hoses may be cheaper in the short term, using the correct transmission cooler hose will likely save money and headaches in the long run. It is important to consider the specific requirements and conditions of the application when choosing the appropriate type of hose.
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Transmission cooler hoses are thicker and stiffer
The cooling line system in an automatic transmission ensures temperatures stay within a safe operating range, usually between 175°F and 200°F. This system works by circulating hot automatic transmission fluid (ATF) from the transmission to the radiator for cooling and then returning. Without this constant ATF flow, the temperature may rise to 270°F or more, causing issues like warped components, degraded fluid, and damaged seals. This can lead to costly repairs or even complete transmission failure.
The thicker and stiffer design of transmission cooler hoses also provides better durability and reliability compared to regular fuel hoses. They are often made from high-pressure rubber, which is known for its resistance to transmission fluid, as well as its flexibility and wide bending radius. This makes them a popular choice for their versatility and cost-effectiveness. However, some people choose to use fuel hoses as transmission cooler hoses because they are cheaper, even though they may not last as long.
There are other options available for transmission cooler hoses besides rubber. PTFE (Polytetrafluoroethylene) hoses, for example, have high chemical resistance and temperature tolerance, making them ideal for high-performance applications like off-roading or racing. Nylon braided lines and steel braided lines also offer improved durability, impact resistance, and abrasion protection compared to standard rubber hoses.
The size of the transmission cooler hoses is also an important consideration. Some people opt for bulk hydraulic hoses to replace their cooler lines, but it can be challenging to determine the correct sizes. The hoses going to the cooler are often larger than the hoses at the bottom of the radiator. It's important to choose the right size to ensure a secure fit and maintain the proper flow of fluid for efficient cooling.
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Fuel line hoses are less durable
Fuel line hoses are susceptible to wear and tear and can fail over time. This can lead to reduced performance and safety hazards, requiring costly repairs. The durability of a fuel hose depends on its compatibility with the fuel type, application, and operating conditions.
Rubber fuel hoses, for example, are prone to degradation as soon as they come into contact with fuel. They also leak fuel vapors, which can be a safety concern and cause an unpleasant smell. While rubber hoses are easy to install, their longevity is questionable due to their susceptibility to temperature extremes, kinking, and misapplication.
PTFE-lined hoses, on the other hand, are known for their durability and ability to prevent fuel vapors. They are resistant to degradation and can withstand a wide temperature range. However, they are less flexible and require special fittings, making them more costly and complex to work with.
Metal lines, typically made from stainless steel, aluminum, or coated steel, are the most durable option for fuel lines. They hold up better than soft materials but are more challenging to fabricate.
Transmission oil cooler lines, or "tranny cooler lines," are designed to withstand the specific conditions of transmission fluid, including higher pressure, heat, and the presence of certain chemicals. They are reinforced to prevent ruptures caused by swelling and softening, which can occur with regular fuel lines. While tranny cooler lines can be used as a substitute for fuel lines in some cases, they are not specifically designed for fuel line applications and may not offer the same durability or longevity as fuel line hoses.
In conclusion, fuel line hoses are less durable compared to other types of hoses, such as PTFE-lined hoses or metal lines. The choice of hose material depends on various factors, including cost, ease of installation, compatibility, and resistance to degradation. While transmission oil cooler lines can be used as a temporary solution, it is essential to consider the potential trade-offs in terms of durability and long-term performance when using them in place of dedicated fuel line hoses.
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Fuel line hoses may not be compatible with ATF
While some sources suggest that a fuel line hose can be used as a temporary solution in a pinch, it is not recommended for long-term use. This is because the hose will eventually get soft and mushy, leading to leaks. The high pressure and heat of the ATF system can cause swelling and softening of the fuel line hose, which will lead to a ruptured line.
Additionally, there are concerns about the compatibility of the rubber used in fuel line hoses with ATF. While some believe that if the hose can withstand both gasoline and diesel fuel, it should be compatible with ATF, this is not always the case. The rubber in fuel line hoses may not be able to withstand the chemicals and additives in ATF, causing the hose to degrade over time.
It is important to note that transmission cooler lines are designed to withstand more pressure and heat than fuel lines, and they are also reinforced to withstand the difference in chemicals in transmission fluid. Therefore, it is recommended to use a transmission cooler line hose for ATF and a fuel line hose for fuel to ensure the longevity and safety of the system.
Furthermore, it is worth mentioning that there are different types of fuel line hoses available, with some designed for low-pressure carbureted fuel systems and others for high-pressure fuel injection systems. It is crucial to choose the correct type of hose for the specific application to prevent leaks and failures.
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Fuel line hoses can be used for quick field fixes
Rubber fuel lines are the most affordable option and are suitable for low-pressure applications. However, they are prone to degradation over time and may not be compatible with certain fluids, such as transmission fluid, which can cause swelling, softening, and leakage.
Steel fuel lines, on the other hand, are more durable and can handle higher pressure levels. They are also resistant to corrosion, making them a good choice for long-term use. Braided stainless steel fuel lines offer the highest level of performance and are commonly used in high-pressure applications due to their resistance to heat, corrosion, and abrasion. They are often recommended for high-pressure fuel injection systems.
Quick-fix flexible fuel line repair kits are available in the market, which can significantly reduce installation time. These kits include pre-measured fuel lines with factory-style quick-connect fittings, eliminating the need for cutting or modifications. They also come with all the necessary connectors and fittings for a complete repair, ensuring a perfect fit and optimal performance.
While it may be tempting to use a cheaper alternative, such as a fuel line hose, for a transmission oil cooler line, it is important to consider the potential risks. Transmission fluid contains chemicals that can cause swelling and softening of regular fuel lines, leading to leaks and potential safety hazards. Therefore, it is always recommended to use the appropriate type of hose or line for its intended purpose to ensure the safe and efficient operation of your vehicle.
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Frequently asked questions
Yes, it can be used, but it is not recommended. While transmission oil cooler lines can be used as a quick fix, they are a poor long-term choice.
The PSI of a transmission oil cooler line is around 25 at idle and 55 when the engine is revved up.
Transmission oil cooler lines are reinforced to withstand more pressure and heat. They are also designed to withstand the chemicals in transmission fluid, which can cause regular fuel lines to swell and soften, leading to a ruptured line.
No, it is not recommended. While it may be cheaper, the Goodyear fuel line is not as strong as the transmission line, which has five times more working strength and four times more burst strength.
Yes, as long as the pressure is within the rating, it should work for a carbureted engine or diesel on the suction side. However, it is important to ensure that any hose carrying gasoline is properly rated for it.








































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