Ameer Randolph
Fuel hoses and vacuum hoses are not interchangeable, and using the wrong type of hose can be dangerous. Vacuum hoses are designed to withstand suction, not pressure, and fuel injection hoses are designed to withstand high pressure. Regular fuel hoses are designed to withstand low to medium pressure. Some types of rubber hoses are not gasoline-resistant and can deteriorate quickly when exposed to gasoline, so it is important to use the correct type of hose for the specific application.
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What You'll Learn
Vacuum hose vs fuel hose durability
Vacuum and fuel hoses have distinct purposes and characteristics, and their durability depends on various factors.
Vacuum hoses are designed to maintain proper engine pressure by allowing fuel, air, and spark to work together at the correct time. They are made of rubber materials and are highly resistant to temperature and corrosion. Vacuum hoses are not designed to hold much pressure but to withstand suction and vacuum without collapsing. They have a higher temperature resistance, typically ranging from −60°C to 190°C, or even as low as −65°C. Their pressure resistance is up to 60 PSI. Vacuum hoses are intended to last for a long time, with excellent reusability, and can be used for at least two seasons.
On the other hand, fuel hoses are designed to transport petroleum products and are resistant to expansion, heat, and pressure. They have thread reinforcing and are made of materials that resist dissolution in gasoline. Fuel injection hoses are designed for high pressure, while standard fuel hoses are meant for medium to low pressure. Fuel hoses do not promise the same durability as vacuum hoses, but they still have a long lifespan, typically lasting around 10 to 15 years. Their reusability is moderate.
In terms of durability, vacuum hoses are designed to last longer and have better reusability. They can withstand higher temperatures and have excellent resistance to corrosion. However, fuel hoses have higher pressure resistance and are less likely to burst under pressure and heat.
It is important to note that using the wrong type of hose can have negative consequences. For example, using a vacuum hose for fuel lines can lead to rubber contamination and hose deterioration due to continuous exposure to gasoline. Therefore, it is recommended to use the correct type of hose for its intended purpose to ensure optimal performance and safety.
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The impact of rubber contamination on fuel systems
The use of a fuel hose for a vacuum line can lead to rubber contamination, which can cause significant damage to the fuel system. Rubber contamination can result from the deterioration of the rubber hose used in the fuel system. Some rubber hoses are not gasoline-resistant and can deteriorate quickly when continuously exposed to gasoline. This can lead to leaks in the fuel system, posing safety risks.
Water contamination in fuel systems is a significant concern. Water can accumulate in the fuel system, promoting the growth of microorganisms or bacteria that feed on hydrocarbons in the fuel. These microorganisms produce a sludge-like substance that can cause corrosion on steel and aluminum surfaces and attack rubber fuel system components. Water can also form ice crystals at low temperatures, clogging fuel lines, filters, or components, potentially disrupting the fuel supply to the engine.
Particulate contamination is another issue that can arise from rubber contamination. Dust, sand, and other particulates can enter the fuel system through openings in tanks or unclean fueling equipment. These particulates can cause clogging in fuel filters and fuel lines, leading to potential engine failure. Regular inspection and cleaning of fuel system screens and filters are necessary to mitigate the impact of particulate contamination.
Additionally, microbial contamination can occur when water is present in the fuel. Microorganisms feed on the alkanes and additives in the fuel, leading to a decrease in fuel quality. This type of contamination can also result in the corrosion of metal parts and the deterioration of rubber fuel cells and lines. Proper prevention, identification, and removal of contamination are crucial to ensure the safe operation of aircraft.
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Hose pressure capacity
Fuel hoses are designed to resist pressure, while vacuum hoses are designed to resist suction. This means that fuel hoses can be used for vacuum lines, but the effectiveness of this will depend on the hose pressure capacity.
Fuel hoses are designed to withstand high pressure, as they need to transport fuel at high pressures from the fuel pump to the engine. They are typically made of durable materials such as rubber, nylon, or plastic, which give them the strength to handle high-pressure levels. The pressure capacity of fuel hoses can vary depending on their specific application and the type of fuel they are designed to carry. For example, high-pressure fuel injection systems may require fuel hoses with a higher pressure capacity than those used in carbureted engines.
On the other hand, vacuum hoses are designed to operate under suction or negative pressure. They are typically made of flexible materials that can withstand being bent and twisted without collapsing. The pressure capacity of vacuum hoses is generally lower than that of fuel hoses, as they are not designed to handle high-pressure levels.
When considering the use of a fuel hose for a vacuum line, it is important to ensure that the hose can withstand the required vacuum pressure. While fuel hoses may have a higher pressure capacity than necessary for a vacuum application, this is generally not an issue as long as the hose can seal and hold the required vacuum pressure. However, it is important to consider the diameter and thickness of the fuel hose, as a hose that is too thick or has an incorrect diameter may not be suitable for a vacuum application.
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Hose treatment to make it gasoline-resistant
When selecting a fuel hose, it is important to consider the type of fuel system and its location. Above-deck fuel systems, such as those found in outboard engines, require different hoses than below-deck systems, which include confined compartments. The four grades of fuel line are A1, A2, B1, and B2, with A1 offering the highest fire resistance and being the best choice for below-deck, high-pressure applications.
Now, if you want to make a hose gasoline-resistant, there are a few things to keep in mind. Firstly, rubber contamination will damage your fuel system over time, so it is important to use a hose designed for fuel systems. Vacuum hoses are typically single-ply with minimum pressure capacity and are not designed to hold pressure. Therefore, they are not suitable for use with gasoline.
To make a hose gasoline-resistant, you can look for hoses with specific treatments or liners. For example, SAE 30R9 hoses have a fluoroelastomer inner liner that can handle all types of fuel, including gasoline, and also resists fuel permeation. Another option is to use a hose with a polytetrafluoroethylene (PTFE) inner liner, also known as Teflon. PTFE is a synthetic resin that is highly resistant to heat and chemicals, including alcohol and fuel additives. It can also handle very high pressure. However, PTFE hoses are more expensive and require specific fittings.
Additionally, when sealing fuel fittings and lines, it is crucial to consider thread types and sealants. Brass or stainless steel are commonly used metals for these components, and it is important to match thread types precisely. When choosing a sealant, opt for one that is chemically resistant to gasoline or other fuels.
In summary, to make a hose gasoline-resistant, look for specialized fuel hoses with treatments or liners that can handle gasoline, such as SAE 30R9 or PTFE hoses. Avoid using vacuum hoses or untreated rubber hoses as they are not designed for gasoline and will deteriorate quickly.
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Hose sizing
When it comes to hose sizing, it is important to note that the diameters of fuel hoses and vacuum hoses differ. Common or standard vacuum hose sizes are 5/32" and 3/16", while a 5/16" hose is considered too big. The fuel line is thicker than the vacuum line.
The size of the hose also depends on its intended use. For instance, 11/32” hoses are required for making the booster active. Additionally, 35/64” clamps are suitable for this size of the hose. It is recommended to measure the outer diameter of a hose and purchase a clamp that matches the size.
The windshield wiper washer system hose is 5/16" and is suitable for vacuum hose applications. It is also important to consider the maximum psi capacity of the fuel line.
While fuel lines are more durable and flexible than vacuum lines, they are also stiffer, which can make them harder to cut and fit.
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Frequently asked questions
No, fuel hoses are not designed for use with vacuum lines. Fuel injection hoses are designed to hold high pressure, while vacuum hoses are designed to withstand low to medium pressure.
Using a fuel hose for a vacuum line can lead to leaks and potentially cause a fire.
You should use a hose that is specifically designed for vacuum lines, such as a silicone vacuum hose.
No, the hose will deteriorate very quickly when exposed to gasoline.
