j30r9 is CARB approved, high pressure line, for gas, diesel, etc, it's really tough and it shouldn't have burst like that, unless it's somehow defective... is the black dust coming from upstream?

 

The Black "dust" is actually smeared mushy melted rubber...like tar....
The hose is the return line....

When I was tightening the clamp that holds it to the fuel tank, I noticed it would not get tight...and upon closer examination I could see that the rubber was disentigrating...
The burst hose (furher up the post) was inside the fuel tank....

 

thx for the clarification, maybe that black dust return line is just really old? i'd expect the short hose that burst to be the same j30r9 material, but who knows... what a weird set of issues, it looks like there is some kind of goop running out the burst hole.

 

That "goop" are the filaments that were pushed out of the inner core when the line burst....

The reason I showed the printing on the line was to relay that the line is rated SAE J30R9 but that it is actually manufactured in the EU and I'm not sure they even use Ethanol there.....

 

the filament inside j30r9 hose is an aramid yarn material, i didn't expect it to look like melted goop from the inside when it tears... j30r9 is tough, it's hard enough to cut, i don't see how it'll blow out from the inside unless it's defective.


of course we don't know for sure what type of hose is on that fuel pump, but since it's on the line going out, and you asked for diagnosis, i was wondering if it's junk in the tank or something in the pump itself let loose.

the other hose that was manufactured overseas is claiming to be made to an american spec, no doubt for export purposes to the u.s... the last automotive hose i got was american-made, it was is really expensive.

 

Here's a better look at the burst hose...
I opened it up to see whats inside.....

 

thx for posting those photos... maybe the take-home for us is that in-tank hose has different requirements.

SAE 30R10 includes hoses that are submerged in fuel. This type of hose is used inside the fuel tank and typically on the fuel pump module. This type of hose uses a special layer on the inside and outside to prevent the core layers from being saturated in fuel. But, don’t use it under the hood. R10 hoses can’t stand the heat

www.tirereview.com/video-fuel-hose-types-and-specifications/

then again, i carry a denso replacement fuel pump around, it's over 13 years old, it has a short section of "dtf intank fuel hose 1901"... it looks like the same thin hose you posted, including the ropy reinforcements... it's in a bag labeled "kitff#3", that i guess came with the fuel pump.

fwiw the clamps are not the typical screw-type that we see all the time.

 

...Unfortunately, most of us have our vehicles apart by the time we Think about the short piece of hose in the fuel pump kit....

...for me, this meant "Trusting" that the Manufacturer/Supplier of the Fuel Pump Kit, took the time to make sure the hose included was 30R10 and submersible .....

 

i never would have thought about that piece of hose, thx for bringing it up and posting all of those pics.