Regan Brown
SAE 30R6 and 30R7 hoses are designed for fuel systems with a working pressure of 50 PSI or less, such as carburetors and TBI fuel injection. They are made with a nitrile rubber inner liner reinforced with a single-ply braided cord and a neoprene rubber cover. However, they are not compatible with ethanol and many modern fuel additives. While both types of hoses serve similar functions, there are some differences between them. For instance, the 30R6 hose has an operating temperature of 212*F, while the 30R7 hose can operate at 257*F. Additionally, there is some debate about whether the 30R7 hose can handle new formulation gas.
Characteristics and Values of 30R6 and 30R7 Fuel Lines
| Characteristics | 30R6 | 30R7 |
|---|---|---|
| Operating Temperature | 212*F | 257*F |
| Pressure Compatibility | 50 PSI or less | 50 PSI or less |
| Inner Liner | Nitrile rubber | Nitrile rubber |
| Compatibility with Ethanol | Not compatible | Not compatible |
| Compatibility with Gasoline Additives | Not compatible | Not compatible |
| Compatibility with Biodiesel | N/A | Not compatible |
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What You'll Learn
- SAE 30R6 is designed for low-pressure applications like carburetors, filler necks and tank connections
- SAE 30R7 is designed for fuel and can be used for low-pressure applications like carburetors
- SAE 30R6 and 30R7 are not compatible with ethanol and modern gasoline additives
- SAE 30R7 is compatible with all modern gasoline and diesel fuels, including gasolines with alcohol and ethers
- SAE 30R9 is designed for high-pressure applications like fuel injection systems
SAE 30R6 is designed for low-pressure applications like carburetors, filler necks and tank connections
SAE 30R6 is a low-pressure hose designed for use in carbureted vehicle applications. It is compatible with gas and gas/ethanol blends but not with biodiesel fuels. It is also not suitable for pressure lines on fuel-injected engines. The SAE 30R6 hose has a temperature range of -40°F to 212°F (-40°C to 100°C) and an operating temperature of 212°F. It is commonly used as a fuel fill hose, often serving as a connection between the filler neck and the tank, where a slight hose bend is required. It is also suitable for auxiliary gas tanks.
The SAE 30R6 hose is constructed with a black nitrile tube, reinforced with polyester, and covered with black chlorosulfonated polyethylene (CSM). It features the same nitrile rubber inner liner as its rubber hose counterpart, the SAE 30R7. However, both the SAE 30R6 and 30R7 hoses are not compatible with ethanol and many modern gasoline additives designed to boost octane. They are designed for fuel systems rated at 50 PSI or less of working pressure.
While the SAE 30R6 is suitable for carbureted applications, it is important to note that it is not recommended for fuel-injected engines. For such applications, a hose with higher pressure capabilities, such as the SAE 30R9, is more appropriate. The SAE 30R9 hose is designed for use with EFI systems, has a higher working pressure of 100 PSI and above, and is compatible with various fuel types, including diesel and ethanol-blend fuels.
In summary, the SAE 30R6 hose is designed for low-pressure carbureted applications and is compatible with gas and gas/ethanol blends. It serves as a fuel fill hose and connects the filler neck to the tank in vehicles. However, it is not suitable for fuel-injected engines or biodiesel fuels. For applications involving higher pressures or specific fuel types, other hose types, such as the SAE 30R9, should be considered.
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$66.49 $75.99
SAE 30R7 is designed for fuel and can be used for low-pressure applications like carburetors
SAE 30R7 is a type of fuel hose that is designed for use with fuel systems. It is rated for low-pressure applications, typically operating at 50 PSI or less, and is commonly used for carburetors, fuel return lines, PCV connections, and emissions devices. This hose can be utilised for both gasoline and diesel applications, although it is not compatible with biodiesel.
The design of the SAE 30R7 hose includes a nitrile rubber inner liner, reinforced with a single-ply braided cord, and a neoprene rubber cover. This construction provides the hose with excellent resistance to gasoline and ageing, along with good tensile strength and bending characteristics.
Compared to its predecessor, the SAE 30R6 hose, the 30R7 offers an improved temperature rating, capable of operating at 257°F (as opposed to 30R6's 212°F). This higher temperature tolerance contributes to its suitability for fuel systems.
Despite its widespread use, the SAE 30R7 hose does have some limitations. It is not compatible with ethanol or many modern fuel additives designed to boost gasoline octane. For applications involving ethanol or ethanol-blend fuels, a different type of hose, such as one with a polytetrafluoroethylene (PTFE) inner liner, is recommended.
In summary, the SAE 30R7 fuel hose is a versatile and commonly used option for low-pressure fuel applications. Its design and construction make it suitable for gasoline and diesel fuel systems, although it may not be compatible with certain fuel types and additives. For specialised applications or modern fuel blends, alternative hose types, such as SAE 30R9, may be required to ensure optimal performance and compatibility.
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SAE 30R6 and 30R7 are not compatible with ethanol and modern gasoline additives
SAE 30R6 and 30R7 hoses were the industry standards for decades. They were designed for fuel systems rated at 50 PSI or less of working pressure, like carburetors and TBI fuel injection. The hoses have a nitrile rubber inner liner reinforced with single-ply braided cord and a neoprene rubber cover. However, they are not compatible with ethanol and many modern additives designed to boost gasoline octane.
Ethanol blends and additives like benzene and toluene are often used to increase the octane level of gasoline but will also suck the oils out of rubber hoses. This dries out the hose, making it brittle, stiff, and prone to leaks. As the hose degrades, small particles of rubber can get into the fuel and plug up fuel filters, fuel injectors, and carburetor passages.
Ethanol, even when mixed with gasoline, can dissolve some plastics and has a negative effect on automotive fuel systems. Ethanol degrades general-purpose fuel hoses like SAE 30R6 and 30R7, causing them to deteriorate. It adversely impacts the hose, as well as rubber seals and other rubber components, causing them to dry out, soften, stretch, or crack.
For these reasons, it is not recommended to use SAE 30R6 or 30R7 hoses with ethanol or modern gasoline additives. Instead, consider using a hose with a polytetrafluoroethylene (PTFE) inner liner, also known as Teflon. PTFE is a synthetic resin that won't react to alcohol or chemical additives in fuel, resists fuel permeation, can handle high pressure, and has a high tolerance for heat. Alternatively, consider upgrading to a SAE 30R9 hose, which is designed to handle all types of fuel, including ethanol-blend fuels, and also resists fuel permeation.
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SAE 30R7 is compatible with all modern gasoline and diesel fuels, including gasolines with alcohol and ethers
SAE 30R7 is a type of fuel hose that is rated for low-pressure diesel applications as well as gasoline. It has an operating temperature of 257°F and a working pressure of 50 PSI. It is not intended for use in pressure lines or fuel injection systems.
SAE 30R7 is compatible with all modern gasoline and diesel fuels, including gasolines with alcohol and ether additives. It is also suitable for use with lube oils and related vapors. However, it is important to note that SAE 30R7 is not compatible with biodiesel. For biodiesel applications, a 30R9-rated hose is recommended.
The compatibility of SAE 30R7 with various fuel types is due to its construction. It features a nitrile rubber inner liner, which is the same material used in SAE 30R6 hoses. This inner liner is reinforced with a single-ply braided cord and covered with a neoprene rubber outer cover.
While SAE 30R7 is compatible with modern gasoline and diesel fuels, it is not without its limitations. One issue is fuel permeation, which can lead to fluid loss over time. Additionally, certain additives in the fuel can cause the hose to crack. Despite these challenges, SAE 30R7 remains a popular choice for diesel and gasoline applications due to its ease of availability and affordability.
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SAE 30R9 is designed for high-pressure applications like fuel injection systems
SAE 30R6 and 30R7 hoses are designed for low-pressure fuel systems, typically rated at 50 PSI or less of working pressure. They are commonly used in carbureted engines and TBI fuel injection systems. These hoses feature a nitrile rubber inner liner, which is not compatible with ethanol and many modern fuel additives.
In contrast, SAE 30R9 hoses are specifically designed for high-pressure applications, such as fuel injection systems with working pressures of 100 PSI and above. They are compatible with modern fuel injection technologies, including EFI (Electronic Fuel Injection) systems. The key advantage of SAE 30R9 hoses lies in their ability to handle a wide range of fuel types, including gasoline, diesel, methanol, and ethanol-blend fuels. This compatibility makes them emissions-legal.
The construction of SAE 30R9 hoses includes a fluoroelastomer inner liner, which provides superior resistance to fuel permeation. This design ensures that the hose can withstand the high pressures and temperatures associated with modern fuel injection systems. Additionally, SAE 30R9 hoses are available in various sizes and lengths, making them suitable for a range of installation requirements.
When compared to SAE 30R6 and 30R7 hoses, SAE 30R9 hoses offer enhanced performance and durability in high-pressure applications. They are designed to meet the demands of modern fuel systems, delivering seamless and efficient fuel delivery. The advanced materials used in SAE 30R9 hoses, such as FKM (fluorine rubber) and ECO (Epichlorohydrin rubber), further contribute to their superior heat and pressure resistance.
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Frequently asked questions
SAE 30R6 hoses are designed for low-pressure applications like carburetors, filler necks and connections between tanks. SAE 30R7 hoses are also designed for low-pressure applications like carburetors or a fuel return line but they can also be used for PCV connections and emissions devices. 30R6 is rated for a 212*F operating temperature while 30R7 is rated for 257*F.
No, neither the 30R6 nor the 30R7 hose is compatible with ethanol and many modern additives designed to boost gasoline octane.
30R7 is designed for low-pressure fuel feed to carburetors and is formulated to be compatible with all modern gasoline and diesel fuels. However, it cannot be used with biodiesel. For biodiesel, you need a 30R9-rated hose.
The best flexible fuel hose for your vehicle depends on your vehicle's requirements. Braided AN hoses can be used on street-driven vehicles but you must check the specifications closely. Hoses with a polytetrafluoroethylene (PTFE) inner liner, better known as Teflon, are resistant to pretty much everything and can handle very high pressure.
