Fuel hose failure

[mowogg]

I have just removed a failed hose from my van- this was a braided line, from a very reputable supplier. Peeling off the braiding revealed the cracking too the line and it is stamped SAE j30 R7.

My spare hose which i carry is R6, but not braided and is now fitted. This again was bought from a reputable supplier. A quick google search would suggest these should both perform with modern fuels

This is not the first failure I have had like this -Can anyone advise what spec I need to overcome this issue? When it fails it drips fuel onto the hot exhaust which cannot be a good thing

[svenedin]

This is why I stopped using braided fuel hose. The braiding means it is impossible to inspect the condition of the hose.

SAEJ30R6 "R6" is safe for fuel containing up to 15% ethanol apparently.

Is it possible that it is the heat of the manifold that is damaging the fuel line? Perhaps you could route the hose differently?

Stephen

[olonas]

"This is why I stopped using braided fuel hose. The braiding means it is impossible to inspect the condition of the hose. "
Agreed. I have had two fail over the years. Fortunately without catastrophic consequences. Both had small pinholes and were detected on initial ignition on - the fuel smell was unmissable!
I now use suitable for Unleaded and Ethanol resistant "bare" hose. Cut to length, as required.

[svenedin]

Yes I cut my own hose to length. If you do this you can have more of an arch shape that keeps the hose away from the heat of the exhaust. I have used a hose made by "Gates". This is expensive but said to be one of the best.

Another option if cutting your own hose to length is to route the hose along the inner wing and then back to float bowl. You need a longer hose for this but if it leaks it should not drip onto the hot exhaust. I would suggest securing the hose with cable ties to prevent chafing if doing this.

Stephen

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Alternative routing

IMG_0598.jpeg (2.44 MiB) Viewed 4241 times

[neilmorey]

I'm not sure heat from the exhaust is the issue, I had to replaced a braided hose a few weeks ago because it was leaking at the pump end which must furthest bit from exhaust.

Replaced with Gates barrier hose from Moss. https://www.moss-europe.co.uk/en-gb/fue ... d-gfh1025x

I found the invoice from ESM when I bought the last hose, it turned out to be 2017 and despite looking new perhaps not surprising it had deteriorated in seven years.

[svenedin]

I'm not sure heat from the exhaust is the issue, I had to replaced a braided hose a few weeks ago because it was leaking at the pump end which must furthest bit from exhaust.

Replaced with Gates barrier hose from Moss. https://www.moss-europe.co.uk/en-gb/fue ... d-gfh1025x

I found the invoice from ESM when I bought the last hose, it turned out to be 2017 and despite looking new perhaps not surprising it had deteriorated in seven years.

I used the same Gates hose (which is sometimes available as offcuts from different suppliers at a cheaper price). I do now carry a spare fuel hose in the boot.




Stephen

[geoberni]

I thought I'd posted this on here at the time, but perhaps I didn't. I certainly posted it on farcebook, but that's another story.

Back in April last year, Basil hadn't been used for a couple of months and as is my want after any short lay-up, I pushed him back out of the garage, to start him on the drive.
I invariably wait a few seconds for the fuel pump click to subside before pulling the Start. But it didn't slow at all.
I turned off and opened the bonnet.
I reached into the car and turned the Ign back on....

20230420_112617.jpg (1.08 MiB) Viewed 204 times

.
I stripped the braid off and was amazed at the number of splits in the section of hose that had been on the bend. Nothing obviously damaged on the straight section.
.

20230420_152334.jpg (882.86 KiB) Viewed 204 times

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There was no obvious reinforcement in the hose. I will no longer use Braided hose on the fuel line.....

20230420_152640.jpg (819.26 KiB) Viewed 204 times

[olonas]

That's exactly the same place, on that bend, as the two hose failures I had (braided).
Not as catastrophic as that though! Only one small pinhole each time. The fuel pump didn't "tick" constantly. The strong aroma of motion lotion alerted me that something wasn't quite right.
Only Ethanol resistant, non braided, reinforced fuel hose for me now.
Much easier to detect by visual inspection any potential issues before they materialise.
One of those leaks is spraying directly on to your exh. manifold too.

[svenedin]

I thought I'd posted this on here at the time, but perhaps I didn't. I certainly posted it on farcebook, but that's another story.

Back in April last year, Basil hadn't been used for a couple of months and as is my want after any short lay-up, I pushed him back out of the garage, to start him on the drive.
I invariably wait a few seconds for the fuel pump click to subside before pulling the Start. But it didn't slow at all.
I turned off and opened the bonnet.
I reached into the car and turned the Ign back on....
20230420_112617.jpg
.
I stripped the braid off and was amazed at the number of splits in the section of hose that had been on the bend. Nothing obviously damaged on the straight section.
.

20230420_152334.jpg
.
There was no obvious reinforcement in the hose. I will no longer use Braided hose on the fuel line.....
20230420_152640.jpg

Wow and yikes! Very lucky you are sensible. It could have been catastrophic.

Stephen