Newer fuel hose standard: sae30r14

Absolutely. We've been using the R-14 spec hoses for several years....

 

Lots of junk out there in those sizes, as witnessed by the number of car BBQs. The stuff that Dave Helms at SRI has proven to be extremely durable. Replace it once and forget it.

 

R14 is 50psi rated. That low pressure hose. Not suitable for injected cars. Notice R9 is rated for injected cars. Additionally, the real step up over R7 is the permeability. That is, vapors won't escape through the hose into the atmosphere. It's nothing but an EPA (or who ever developed it) standard for reducing emissions. No big deal unless you are an extreme Greenie. Does SRI give such specs? I thought the SRI rap was that it works for E10. Just another unnecessary, over hyped, boutique product.

 

The high pressure lines / conduits / manifolds on all FI cars are either --- metal (typically steel), high-density structural polymer (specifically "plastic"), or steel over-braided.

Therefore, a high-pressure rated "rubber" (any elastomer) hose is not needed...... nor recommended. For the low pressure side (return, vent, emissions, etc.) of the system, 50 psi is more than adequate. And, permeability, temperature tolerance, and chemical resistance (internal & external) are the most important considerations for performance and longevity.

 

R14 is the new R7. Low pressure, rated for ethanol, low permittivity. I checks out R14 and it was developed to meet California emission requirements. As far as 50 psi rated hose for injected cars, read this from Gates. R7 not recommended for injected cars. Since R7 and R14 have the same pressure ratings I think the extrapolation is valid. Anyway, I would not put a 50 psi hose on any of my cars.

http://www.gates.com/oreilly/tech_tips/PermeationResistantFuelLineHose.pdf

Also this comparison between R7, R9 and R14.

http://www.gates.com/oreilly/tech_tips/barricade_info.pdf

 

I certainly would not put a low pressure hose anywhere on an injected car after the fuel pump, including the returns.

FWIW, on a 308 QV the return lines connect to the fuel tank via short rubber hoses at the nipples on the tank, OE.

 

Considering that the returns on the 308 are braded into steel into rubber I can not imagine that they used low pressure hoses. R9 an fine for E10-E15. Might be a problem with E85 but I don't know of any Ferraris running on E85 yet.

Just because the return hose is connected to the tank doesn't mean the pressure along the entire length of the hose is low. And should the hose become blocked for some unknown reason....do I need to explain? Bottom line is that low pressure hoses do not belong anywhere on the high pressure side of a fuel system. Not open to argument. Simply a safety precaution against an unnecessary risk.

 

These guys have a nice selection and they ship super quick.

https://www.belmetric.com/metric-hoses-c-14/

 

If you read the spec (revision 14), the ONLY change from previous revision is the adoption of a "permeation barrier" which is achieved by an exterior covering over the hose.

However, and this is very important, there is NO standard regarding what this covering (barrier) is to be ---- which leaves it up to the interpretation of each hose manufacturer to utilize whatever covering material / construction they determine to be best suited for their products.

Therefore, this is a standard without a standard, which makes it next to useless as a technical specification.

As for high-pressure fuel hose, the useful and applicable standard is still the revision which introduced the requirements for "MPI fuel injection hose" --- which was revision 9 (saej30r9). All subsequent revisions to saej30 address other issues and other applications (i.e., NOT high-pressure working strength).

FWIW

Here's a brief summary of the revisions to saej30, as provided directly from SAE ---

The upshot is that if you want to know what an adequate hose is for high-pressure fuel applications --- it is any that conform to the saej30r9 standard.


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Bell Metric metric hoses are all R7 regardless of what they say about pressure rating. I bought some and it is clearly marked R7. When I called and asked about it being listed as good for injection they told me that is what their supplier told them.
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I highly doubt there is anyone anywhere who can answer that.

That said, my suggestion for bounding the problem is this ---

Contact the various suppliers that are making that hose today (the cloth over-braided "rubber" hose) as replacement / aftermarket products. And, ask them what theirs is pressure rated at, or to what if any, sae spec it meets.

Then, it is perfectly reasonable to assume that the old Ferrari OE hoses were no stronger, and most likely somewhat weaker, as they were using lesser quality / performance materials 30+ years ago.

 

Not all AN hose is the same. Some are Teflon lined while others are Buna-N. I've been using Aeroquip hose to replace my PVC lines for my rollover valves. series 8600 in 3/8", Part number 860006. It is a synthetic rubber with a working pressure of 375psig. It has a cloth braid with a smooth blue rubber coating on the outside. Hose ends were the OEM Ferrari hose barbed fitting with crimp type clamps.
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I think this is being way over thought, typical of FChat.

 

Hey, Yuup. I just did my 348 with all AN6 and 1000psi

Just in case I can use it as a pump to fill my Jacuzzi

 

I just used 1/2 braided steel with AN6 fittings pretty simple. You just need to do an inventory whats needed and take your time. I been using areoquip since they started on Rt17 in NJ maybe 1980 or so. I never use a hose clamp on a fuel line. I took them off the return line

The hose clamp safety wired is no bueno IMHO with the crappy fitting

Do it right. Now I can swap any part easily for the sake of change with standard fittings

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