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SAE30R6 KX Fuel Line

Don't use this stuff.

Anyone have any ideas on what this spec means? From what I can figure, the 30R6 is just a pressure test for bursting strength. Can't find any info on the KX.

I'm guessing it is unsuitable for alcohol containing fuels (which is pretty much all fuels in MI these days). I replaced the fuel line from the tank to the fuel pump with some of it 4 years ago, and during my annual pre-seasonal inspection, I discovered the fuel line was full of cracks. The piece I didn't use sat in an uninsulated garage the whole time, and appears to be fine.

I've replaced it with some Earl's fuel line I bought from a local racing shop ... hopefully with better durability.


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Old 04-12-2012, 02:59 PM
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I can just make out the date code of 99. That's 12 or 13 year old hose which should be replaced anyways.

According to Goodyear 30R6 hose:

- Specially designed for gas,oil, diesel, and other fuels
- Resists temperatures up to 212F (100C)
- Minimum Burst 175 PSI (1.2MPa)
- Meets and exceeds SAE J30R6 specifications

Need to see if I have access to the SAE standard at work to see what the KX code means.

Last edited by tomeric914; 04-23-2012 at 02:48 PM..
Old 04-23-2012, 02:42 PM
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From the standard:

"Low-Pressure Coupled and Uncoupled Synthetic Rubber Tube and Cover (SAE 30R6), (SAE 30R7), (SAE 30R8) Hose which may be supplied either coupled or uncoupled for use with gasoline, diesel fuel, lubrication oil, or the vapor present in either the fuel system or in the crankcase of internal combustion engines in mobile, stationary, and marine applications. Exposure of these hoses to gasoline or diesel fuel which contain high levels, greater than 5% by volume, of oxygenates, i.e., ethanol, methanol, or MTBE (methyl tertiary butyl ether), may result in significantly higher permeation rates than those listed for 30R6, 7, or 8. This hose is for maximum working pressures of 0.34 MPa (50 psi) up to and including 9.53 mm (3/8 in) ID and 0.24 MPa (35 psi) for over 9.53 mm (3/8 in). For 30R6 hose in excess of 25.40 mm (1 in), the working pressure is 0.11 MPa (16 psi). The hose may be furnished in long lengths, specific cut lengths, or as a part preformed to a specific configuration. This hose is suitable for use in temperatures up to 100 C (212 F) for 30R6, 125 C (257 F) for 30R7, 150 C (302 F) intermittently and 135 C (275 F) continuously for 30R8."

So, the standard for 30R6, 30R7 and 30R8 hose says that the permeation rate may be significantly higher with ethanol extended gasoline in excess of 5%.

Looking specifically at 30R9 fuel injection hose in the standard:

"Hose primarily intended to meet the demands of fuel injection systems. These would include, for example, electronic fuel metering (EFM), electronic fuel injection (EFI), throttle body injection (TBI), and the like. Other areas of utility are those applications requiring fuel permeation resistance exceeding 30R8 and ones which require fuel resistance greater than that obtainable with 30R6, 7, and 8. Exposure of this hose to gasoline or diesel fuel that contains high levels, greater than 5% by volume, of oxygenates, i.e., ethanol, methanol, or MTBE may result in significantly higher permeation rates than realized with ASTM Fuel C. This hose may be supplied in either a coupled or uncoupled form, and is useful in the transportation of gasoline, ethanol extended gasoline, diesel fuel, lubrication oil, or the vapor present in either the fuel system or the crankcase of internal combustion engines in mobile, stationary, and marine applications. This hose has a maximum working pressure of 0.69 MPa (100 psi) up to and including 12.70 mm (1/2 in) ID. This hose may be furnished in long lengths, specific cut lengths, or as a part preformed to a specific configuration. This hose is suitable for use in normal operating temperatures of 34 to 135 C (29 to 275 F) and intermittent use at 150C (302 F).

The construction of this hose typically consists of a smooth bore tube or laminated tube(s) of a synthetic rubber compound(s) resistant to chemical attack, swelling, and permeation by gasoline, oxidized ("sour") gasoline, ethanol extended gasoline, diesel fuel, and oil or lubricants. It shall be suitably reinforced with a textile fiber, yarn, cord, or fabric, and a cover of a suitable oil-, ozone-, and heat-resistant elastomer."

The 30R9 subsection utilizes the same wording as the 30R6, 30R7 and 30R8 with respect to permeation rates being significantly higher with greater than 5% ethanol but it adds that the construction shall be resistant to... ethanol extended gasoline.

Overall, the elastomer specifications for 30R9 are tighter than 30R6. Most notably is the Permeation Resistance in gm/m^2/day where 30R9 is 15 and 30R6 is 600!

The KX at the end remains a mystery though. There is no reference to those digits in the standard.

Hopefully, this helps those in need to make an informed decision about which hose to use. I personally have used R6 for many years with no problems. If you are concerned, upgrade to the R9 hose.
Old 04-24-2012, 05:32 AM
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Quote:
Originally Posted by tomeric914 View Post
...

Overall, the elastomer specifications for 30R9 are tighter than 30R6. Most notably is the Permeation Resistance in gm/m^2/day where 30R9 is 15 and 30R6 is 600!

...
jEZUS kEE-RIST!

600 g day-1 m-2

just think about that...

Thanks for posting the above
Old 04-24-2012, 11:37 AM
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Quote:
Originally Posted by RWebb View Post
600 g day-1 m-2

just think about that...
Ok. Take 5/16" hose for an example:

D = .3125" or roughly 8mm

Perimeter of the inside of the hose is Pi x D = 3.14 * 8mm = 25.1mm

25.1mm = .0251 meters which represents the width of the hose ID if it were slit down the hose and opened up.

Area = length x width

The area is 1 square meter which 600 grams permeates per the standard

Solving for length:

Area / width = length

1 m^2 / .0251 m = length

Length of hose required for worst case maximum (600 g) of the standard is 39.8 meters.

Solving per centimeter, 600 g / 3984 cm = .15 grams/meter of 5/16" hose allowable permeation per the standard

30R6 hose is 40 times more permeable than 30R9 hose at worst case per the standard. Is this terrible? Not necessarily. This just shows the maximum per the standard.

Again, hopefully, this helps those in need to make an informed decision about which hose to use. If you are concerned, upgrade to the R9 hose.
Old 04-24-2012, 01:15 PM
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I think it might well be terrible over time. We are seeing some sort of brownish glop form on vehicles with new fuel hoses... mainly where the fuel hose is encased in a sheath.


Here is a thread in OT:

Rubber Fuel Hose

Last edited by RWebb; 04-24-2012 at 05:26 PM..
Old 04-24-2012, 04:50 PM
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Thanks tomeric for looking it up. Sounds like R6 does neither specifically allow nor disallow alcohol, and compatibility might be up to the manufacturer of the fuel line. I have some R9 FI line I installed at the same time & location (pump to front bulkhead, and return line back to tank) and it is still fine.

Maybe I'll do some experimentation and throw some of the R6 hose in 100% ethanol, just to see what happens...
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Old 04-26-2012, 03:32 PM
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Been using the R9 as well with no problems ...........so far.
Old 04-26-2012, 04:29 PM
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No problem. I've been meaning to pull the standard for a while to see exactly what it said.
Quote:
Originally Posted by burgermeister View Post
Maybe I'll do some experimentation and throw some of the R6 hose in 100% ethanol, just to see what happens...
The only problem with that experiment is that the exterior of the hose may be of a different material than the interior which could lead to an inconclusive result.

I brought back the R6 hose I bought to see if my FLAPS had R9. They did, so I returned the R6 and purchased the R9. They ended up charging me the R6 price per foot. Oh well
Old 04-26-2012, 04:51 PM
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I thought the R9 was a little pricey at my local auto parts.
Old 04-26-2012, 04:58 PM
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I had a similar experience with some fuel hose I bought at the Chrysler dealer. Less than a year later I smelled gas. Was really lucky I didn't go up in flames.
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Old 04-26-2012, 05:04 PM
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Old 04-26-2012, 05:04 PM
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