Petrol/Gasoline Fuel Hose Specification

[Simon B]

Our main fuel line has cracked badly it's less than 2 years old, the hose supplied was "fuel injection" hose does anyone know the standard spec required i.e BS or EN for fuel hose that may be subjected to sunlight for long periods of time?

[BruceB]

Sunlight does tend to go for the rubber, I have managed to get every single inch out of the sunlight for that very reason.
I assume it is just the part exposed at the transom end that is cracked up?

[Downhilldai]

ISO 7840
May be worth encasing it in Spiral Wrap to keep the rays off.

[Simon B]

Cheers chaps will check this out, its cracking in areas that are not exposed to light. We have some even older hose on some 30l aux tanks as yet un cracked - hence my suspicion of wrong spec used - will have to have stern words with the nobrot that bought it!

Also when you cut it open it doesnt have a liner in it.

[Simon B]

Anyone seen fuel hose that looks cotton braided and is thin walled? That's what has been sent, am going to read iso 7840!

[BumbleAbout]

Yes - on cars ! Fixed marine fuel hose should be marked with "ISO 7840" on the outside - there are lots of sellers who possibly not knowing the difference will sell you automotive fuel hose for the same price.

"ISO 7840:2004 specifies general requirements and physical tests for fire-resistant hoses for conveying petrol and diesel oil, designed for a working pressure not exceeding 0,34 MPa for hoses with nominal bore up to and including 10 mm and 0,25 MPa for hoses with larger bore in craft of hull length up to 24 m.

ISO 7840:2004 applies to hoses for small craft with permanently installed fuel systems. It does not apply to hoses entirely within the splash well at the stern of the craft connected directly to an outboard engine."

I found some at http://www.chandleryworld.co.uk/acat...O7840A1A2.html and on eBlag along with lots of black cotton braided stuff. Given that there was virtually no different in price, I just went for the marine specification.