Sylvie Willis
Propane vehicles have a lot in common with gasoline vehicles, but there are some key differences. Propane is stored as a liquid in a low-pressure tank, and there are two types of propane fuel-injection systems: vapor and liquid injection. In vapor-injected systems, liquid propane travels as a liquid through a fuel line into the engine compartment, where it is converted to a vapor. In liquid propane injection engines, the propane remains a liquid until it passes through the fuel injector. Rubber fuel lines are known to deteriorate at a rapid rate, and some sources suggest that they are not suitable for propane engines.
| Characteristics | Values |
|---|---|
| Compatibility | Propane rubber hoses are not compatible with gas fuel hoses. |
| Pressure | Propane is stored at a relatively low pressure, but it is used at a lower pressure than a car fuel system. |
| Hose type | LPG hoses have pin-pricked holes in the cover to allow gas to escape in small quantities. |
| Hose material | PTFE (Teflon) is a plastic material that is impervious to the degenerative effects of fuel and creates a vapor barrier. |
| Hose fittings | Hose fittings and assemblies are available for purchase separately or as part of a kit. |
| Hose quality | Hose quality varies, and it is important to use a hose that is rated for propane and will not deteriorate. |
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What You'll Learn
LPG hose has pin-pricked holes to allow gas to escape
LPG, or propane, hoses are not the same as gas fuel hoses. LPG hoses have pin-pricked holes in the cover to allow gas to escape in small quantities. This is an important safety feature that prevents the build-up of gas pressure and the risk of explosion. Without these holes, gas can bubble up and escape from the hose, even if the tube has been treated to handle LPG.
While some rubber hoses may be compatible with LPG, it is important to use a hose specifically rated for propane. Propane suppliers or industrial hose suppliers can provide hoses suitable for propane. Using a hose not rated for propane can be dangerous and may not be compatible with the gas.
It is also important to consider the pressure rating of the hose. Most propane use is low pressure, with propane stored at high pressure in tanks but burned at lower pressure. A hose with a high-pressure rating, such as 65 PSI or higher, may be suitable for propane, but it is essential to check with a reputable supplier or manufacturer.
In addition to compatibility and pressure ratings, the durability and flexibility of the hose are also important factors. Stainless steel braided hoses with a stainless convoluted tube are recommended for LPG as they are more durable, flexible, and better suited to outdoor use. These hoses are less susceptible to damage from animals and can withstand external elements better than rubber hoses.
Overall, it is crucial to use the correct hose for propane engines, ensuring compatibility, safety, and durability. LPG hoses with pin-pricked holes are designed to allow gas to escape safely and are an essential component of propane engine systems.
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Propane rubber hose is not the same as a gas fuel hose
Propane and natural gas are not interchangeable with rubber hoses. Natural gas is kept at lower pressure than propane, and the two gases have different chemical properties, requiring different hoses. Propane gas hoses are made of rubber, thermoplastic, or PVC (polyvinyl chloride) materials, specifically designed for use with propane gas.
A standard rubber hose is not suitable for propane gas applications. Propane gas is highly flammable, and a hose that is not designed for this purpose could result in leakage or damage. LPG (liquefied petroleum gas) hoses have pin-pricked holes in the cover to allow the gas to escape in small quantities. So, any rubber hose that does not have them will bubble up, even if the tube has been treated to handle LPG.
The compatibility of the hose with the gas is crucial. Some hose suppliers are adamant about using propane-rated hoses for propane burners. Even a natural gas flex line should not be used for propane. It is recommended to use a propane supplier to get the right hose.
The pressure of the propane gas is also an important factor. Propane gas hoses must be rated for high pressure, typically 350 PSI or higher. While some car fuel lines can handle high pressure, it is not safe to use just any rubber hose for propane. It is important to follow the manufacturer's recommendations and use the correct type of hose to avoid potential hazards.
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Rubber fuel lines are deteriorating at an alarming rate
The use of rubber fuel lines in propane engines is not recommended due to the risk of deterioration and failure. Rubber fuel lines are susceptible to degradation caused by the additives in modern pump gasoline, including ethanol and other unknown substances. This degradation can occur rapidly, leading to leaks and potential safety hazards.
The aging process of rubber fuel lines is accelerated when a vehicle is only occasionally driven. In such cases, the fuel line undergoes multiple cycles of wetting and drying, which can cause the line to fail prematurely. The problem is challenging to diagnose as the deterioration may occur on the inside of the hose, while the exterior remains intact.
To address this issue, it is crucial to prioritize the use of fuel lines specifically designed for propane engines. Propane suppliers or industrial hose suppliers can provide hoses that are compatible with propane and rated for the appropriate pressure levels. Additionally, alternative materials such as stainless steel or polytetrafluoroethylene (PTFE) hoses can offer improved durability and resistance to fuel degradation.
While rubber fuel lines may be convenient and flexible, their alarming rate of deterioration underscores the importance of regular maintenance and proactive replacement to prevent leaks and ensure the safe operation of propane engines.
To summarize, the deterioration of rubber fuel lines in propane engines is a significant concern. The use of propane-rated hoses or alternative materials is essential to mitigate the risk of failure. Regular maintenance and proactive replacement of fuel lines are crucial to maintain the safety and reliability of propane-powered vehicles.
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Propane is stored as a liquid in a low-pressure tank
Propane is stored as a liquid in a pressurised tank. The pressure in the tank is usually high, but the gas is burned and used at a lower pressure than a car fuel system. When it comes to propane engines, the compatibility of materials is crucial. While rubber fuel lines are commonly used in automotive applications, they may not be suitable for propane due to the potential for deterioration and leakage. Rubber fuel lines can be susceptible to degradation over time, especially with the addition of ethanol and other additives in modern pump gasoline. This can lead to leaks, which pose safety hazards.
In the context of propane engines, it is essential to use hoses specifically rated for propane. LPG (liquefied petroleum gas) hoses, for example, have pin-pricked holes in the cover to allow gas to escape in small quantities. Using a standard rubber hose without these holes can lead to bubbling and cover-up issues. Propane suppliers or industrial hose suppliers are recommended sources for obtaining the appropriate propane-rated hoses.
It is worth noting that some car fuel lines are designed to handle high pressure and various gases, but it is crucial to consult with experts or refer to manufacturer recommendations to ensure compatibility and safety. The use of stainless steel braided hoses with a stainless convoluted tube is suggested for improved durability and flexibility. Additionally, materials like PTFE (polytetrafluoroethylene), commonly known as Teflon, offer resistance to fuel degradation and create a vapour barrier to prevent fuel vapour leaks.
While solid lines and fittings are generally more reliable, some flexibility is necessary to accommodate engine vibrations. A combination of steel lines with short rubber sections can provide the required rigidity and adaptability. It is important to consult with professionals or refer to manufacturer guidelines to ensure the safe and proper use of rubber fuel lines in propane engines.
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The best solution for fuel lines is a material called PTFE
While rubber fuel lines are readily available for a variety of applications, they are not suitable for propane engines. Propane will rot the rubber, and the fuel line is likely not rated for much pressure. LPG (propane) hoses have pin-pricked holes in the cover to allow gas to escape in small quantities, so any rubber hose without these holes will bubble up.
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Frequently asked questions
No, it is not recommended to use a rubber fuel line for propane engines. LPG (propane) hoses have pin-pricked holes in the cover to allow the gas to escape in small quantities. Rubber fuel lines will deteriorate over time and are not suitable for propane.
The best material for a propane fuel line is a hose that is specifically rated for propane. Natural gas flex lines should not be used for propane.
Alternatives to rubber fuel lines include solid lines and fittings, or a material called PTFE (polytetrafluoroethylene), which is a type of plastic that is also known as Teflon.
PTFE fuel lines are impervious to the degenerative effects of fuel and create a vapor barrier to prevent fuel vapors from leaking.
Yes, PTFE hoses are susceptible to kinking due to the plastic's inelastic nature. They also require specific hose ends and assembly procedures, which can be more expensive.
