Sylvie Willis
There is much debate on whether a fuel line can be used for coolant. Some people claim that fuel lines are more expensive and not meant to be used for coolant, while others argue that they have used fuel lines for coolant without any issues. It is important to note that the construction of fuel hoses and coolant hoses differs. Coolant hoses have a membrane woven into the rubber to control expansion due to high temperatures, while fuel hoses are typically reinforced to handle higher pressure. The type of coolant also matters, as ethylene glycol, an alcohol-based compound, can break down certain kinds of rubber.
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What You'll Learn
Fuel hose can work as a coolant line in the short term
Using a fuel hose as a coolant line is generally not recommended. However, in certain situations, it can be used as a short-term solution.
There are several factors to consider when deciding whether to use a fuel hose as a coolant line. One important consideration is the type of coolant being used. Some coolants, such as ethylene glycol, are alcohol-based compounds that can break down certain kinds of rubber. It is crucial to ensure that the fuel hose is compatible with the type of coolant to avoid damage or leaks.
Another factor is the temperature of the coolant. Coolant systems typically operate at high temperatures, and fuel hoses may not be designed to withstand such temperatures over extended periods. Prolonged exposure to high temperatures can cause the fuel hose to become brittle and fail over time. Therefore, if a fuel hose is used as a coolant line, it is essential to monitor it closely and replace it as soon as possible with a proper coolant hose.
In some cases, reinforced fuel tubing or suitably rated fuel/antifreeze proof tubing may be used as a temporary solution for small bore coolant hoses. This is especially relevant when facing challenges in sourcing the correct size of coolant hoses or dealing with discontinued parts. However, it is important to note that fuel/oil-rated hoses are not designed for coolant and may not provide a long-lasting solution.
Additionally, it is worth noting that using a coolant hose as a fuel line is strongly discouraged. Coolant or plain rubber hoses should not be used as fuel lines as the inner lining can turn into a putty-like substance, eventually passing into the carburettor or injection system and causing issues. Therefore, while a fuel hose can work as a coolant line in the short term, using the appropriate type of hose for its intended purpose is always recommended to ensure the longevity and safe operation of the system.
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Coolant hose is EPDM, suitable for temperatures up to 120-150°C
Coolant hoses are made of EPDM, a synthetic rubber, and are suitable for temperatures ranging from −30°C to 120-150°C. They are designed for various truck applications and provide high strength and resistance to coolants, temperature changes, and environmental factors such as ozone.
EPDM coolant hoses are a reliable choice for your vehicle's cooling system, offering durability and compatibility with the temperature requirements of most automotive applications.
However, it is important to note that some people have debated using fuel lines as coolant lines, which is not recommended due to safety concerns. While a fuel line may initially seem like a viable option, it is not designed to withstand the same temperature extremes as a coolant hose. Over time, the heat from the cooling system can cause the fuel hose to become brittle and fail, leading to potential leaks and costly repairs.
Therefore, it is crucial to use the correct type of hose for your specific application. While EPDM coolant hoses are suitable for temperatures up to 120-150°C, they should not be substituted for fuel lines, as each type of hose is designed with specific materials and characteristics to meet the demands of their intended function.
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Fuel hoses are reinforced to withstand higher pressure
Fuel hoses are designed to withstand higher pressure, with some hoses having an operating pressure of 250 psi and a burst pressure of up to 1000 psi. The reinforcement in fuel hoses is necessary to handle the pressure of modern blended gasolines and diesel fuels, which can have higher pressures than traditional gasoline.
The materials used in fuel hoses have evolved to meet the demands of modern fuels. Traditional rubber hoses were compatible with older gasoline formulations, but modern fuels often contain ethanol blends and additives like benzene and toluene to increase octane levels. These additives can dry out rubber hoses, making them brittle and prone to leaks. To address this issue, modern fuel hoses are made with materials like nylon, nitrile rubber, and polytetrafluoroethylene (PTFE), also known as Teflon. These materials offer higher resistance to specific fuel types and can handle higher pressures.
Nylon fuel hoses, for example, are resistant to most fuel types, including nitro methane, and can operate at pressures up to 250 psi. They also have a wide operating temperature range of -30 to 120 degrees Celsius. This flexibility in temperature and pressure handling makes them suitable for various applications. Additionally, nylon hoses are cost-effective due to their simple construction.
Another type of reinforced fuel hose is the fabric-reinforced tank fuel hose, which is specifically designed for use in fuel tanks. These hoses are made from NBR/NBR (butadiene acrylonitrile rubber) and are resistant to fuels such as gasoline, E10, diesel, and bio-diesel. They are also distinguished by their temperature and heat resistance, making them suitable for high-pressure applications.
While fuel hoses are designed for higher pressure and specific fuel types, it is important to note that they are not always suitable for use with coolants. Some sources advise against using fuel hoses for coolant systems due to the potential for heat-induced failure. Coolant systems operate at higher temperatures, and over time, the heat can make the fuel hose brittle, leading to leaks and failures. Therefore, it is recommended to use the proper radiator hose designed for coolant systems to avoid such issues.
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Coolant hoses have a membrane to control expansion due to high temperatures
The cooling system of an engine is a complex network of hoses, tanks, and valves that work together to regulate the temperature of the engine. The coolant hoses are an essential component of this system, responsible for transporting the coolant fluid throughout the engine to maintain optimal temperatures.
Coolant hoses are typically made of rubber composites, specifically EPDM, which can withstand temperatures up to 120-150°C. These hoses are designed to handle intense pressure, extreme temperatures, oils, dirt, and sludge. However, over time, they can degrade due to various factors, including dry air, heat, and use. This degradation can lead to tiny cracks and pinholes, which, if left unchecked, can result in ruptures and coolant leaks.
One crucial aspect of the coolant hose is its membrane, which plays a vital role in controlling expansion due to high temperatures. As the engine's temperature rises, the coolant's temperature also increases, leading to a build-up of critical pressure within the sealed system. This pressure causes the cooling device of the engine to expand, and the excess air is accumulated in the membrane tank. The membrane tank, equipped with a pressure control valve, helps to release the accumulated air gradually, preventing the container from exploding.
The membrane tank's function is not limited to high temperatures but also plays a significant role during cold weather. In low-temperature conditions, the engine can cool down rapidly, leading to a decrease in pressure in the cooling system. To address this, the inlet valve in the membrane tank opens, allowing air to be sucked into the system. This prevents the plastic container from shrinking and maintains the coolant level, ensuring the engine's optimal performance.
While some individuals have suggested using fuel lines as coolant hoses, it is generally advised against. Fuel hoses may not be compatible with certain coolants, such as ethylene glycol, an alcohol-based compound that can break down specific kinds of rubber. Additionally, the heat from the cooling system can make the fuel hose brittle over time, leading to potential failures and leaks. Therefore, it is recommended to use proper coolant hoses designed to withstand the extreme temperatures and pressures of the engine's cooling system.
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Silicone hoses can be used for both fuel and coolant
Silicone hoses are stable at a wide range of temperatures and pressures. They are generally inert, making them safe for a range of applications, from baby food to engine coolant. However, fuel and oil are some of the few substances that can break down their molecular structure, making them unreliable for use in fuel lines.
Standard silicone hoses are porous and, therefore, unsuitable for oil or fuel. However, some companies supply fluorolined silicone hoses designed to prevent fuel and oil from penetrating the hose wall. These hoses are not recommended for fuel lines or heavy fuel filling but are suitable for occasional fuel usage and vapour.
Silicone hoses are ideal for race cars as they can carry fluids at much higher temperatures (max 350°F/177°C) than standard EPDM rubber radiator hoses (max 257°F/125°C). They are also more durable than rubber hoses, outlasting them by a factor of 10.
Despite the advantages of silicone hoses, some people still prefer to use fuel hoses for coolant lines. This practice is not recommended as it can lead to leaks and failures. Fuel hoses can become brittle over time due to heat, causing them to fail and release all the coolant.
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Frequently asked questions
No, it is not advisable to use a fuel line as a coolant. Fuel lines are designed to endure gasoline and may not withstand high temperatures. Coolant hoses, on the other hand, are built to handle high temperatures and have a membrane to control expansion.
Using a fuel line for coolant may lead to leaks and potential damage to the ECU. Over time, the heat will make the fuel hose brittle, leading to potential failure and leaks.
No, it is not recommended to use a coolant hose for fuel. The inner lining of the coolant hose can turn into a putty-like substance and cause issues in the carburettor/injection system.
It is best to use a hose specifically designed for coolant, typically made of EPDM rubber, which can withstand temperatures up to 120-150°C.
Yes, you can use suitably rated fuel/antifreeze proof tubing or reinforced silicone hose for either purpose. However, it is important to ensure that the tubing is compatible with the specific fluid and application.
